The following sections describe each screen operation when using the ladder monitor function.
The screens used for explanations in this chapter are mainly those of the A975GOT.
The ladder monitor display screen varies slightly with the GOT used. Refer to Section 6.1 for differences between the display screens.
6.1 Display screens
The ladder monitor display screen varies with the used GOT and target PLC CPU.
(1) MELSEC-A/FX ladder monitor
Used GOT PLC read screen Ladder monitor screen
A985/A97*/
960GOT
• Sequence program
: Max. 8 lines (1 line: Max. 11 contacts) displayed
• When the display screen type is the EL, the [Print Screen] and [Cancel Print] keys are not displayed.
(2) MELSEC-QnA ladder monitor
Used GOT PLC read screen Ladder monitor screen
A985/A97*/
960GOT
• Sequence program
: Max. 8 lines (1 line: Max. 11 contacts) displayed
• When the display screen type is the EL, the [Print Screen], [Cancel Print], [JUMP ] and
6
(3) MELSEC-Q ladder monitor
Used GOT PLC read screen Ladder monitor screen
A985GOT
• Sequence program
: Max. 15 lines (1 line: Max. 11 contacts) displayed
A97*/960 GOT
• Sequence program
: Max. 8 lines (1 line: Max. 11 contacts) displayed
• When the display screen type is the EL, the [Print Screen], [Cancel Print], [JUMP ] and [JUMP ] keys are not displayed.
A956WGOT
• Headings are not displayed in the file list. • Sequence program
: Max. 5 lines (1 line: Max. 7 contacts) displayed
• The [Print Screen] and [Cancel Print] keys are not displayed.
6
6.2 Screen operation and screen changes when monitoring
This section includes an explanation of the PLC read operation that reads out the sequence program from the PLC CPU when executing the ladder monitor, the ladder read operation that specifies the sequence program to be displayed on the ladder monitor screen, and the screen movement when executing the ladder monitor.
6.2.1 Reading data from the PLC
The operation of reading the sequence program for the ladder monitor from the PLC CPU is described below.
The operation procedures vary depending on the PLC CPU to be monitored.
All of the keys used with the operation are touch keys displayed on the screen.
Touch the position where the object key is displayed and enter the data.
(1) When the MELSEC-A/FX ladder monitor is executed [Operation procedure]
1) Touch the ladder monitor starting touch switch on the monitor screen prepared by the user or touch the LADDER MON. on the utility screen to start the ladder monitor function.
Exit Ladder Break Menu Print Screen
Cancel Print 7 4 1 0
8 5 2
− 9 6 3
A C E AC
B D F DEL NET. No [ 0]
READ ST. ( )
LADDER MON. (Touch)
To the following page
2) Specify the network No. and station No. for the object PLC CPU.
(For data link system, CC-Link system)
NET NO : 0
READ ST. : FF (Own station) 0 (Master station) 1 to 64 (Local stations) (For network system)
NET NO : 1 to 255 (Host Net) 0 (Master station) READ ST. : FF (Own station)
1 to 64 (Control station) 1 to 64 (Normal station)
3) In "Read Selection", specify the sequence program to be read from the object station.
Specify whether or not to perform comment read.
4) Input the keyword that is registered to that station.
If no keyword has been registered, nothing has to be entered.
5) The contents and capacity of the read procedure are displayed. When you touch Break, the read procedure is interrupted. When reading resumes, it stars at the beginning.
From the previous page
: Select input area.
Alphanumeric: Input network No. and station No.
Exit Ladder Break Menu READ STATE
NETWORK NO.0 PLC NO.FF
PARAM PROG CMNT EX.CMNT
READ SELECTION
READ PROGRAM COMMENT
MAIN PROGRAM 1 SUB PROGRAM 2 (A4U) SUB PROGRAM 3 (A4U)
SETTING NON SETTING
← →: SWITCH ↑↓: SEL ↵: SET
(Touch: Input confirmation)
: Setting item switch (Read program comment) : Select program
(Read program)
Select comment read enabled/disabled (Comment)
(Touch) Keyword is not registered.
Keyword is registered.
Alphanumeric: Enter a keyword. (*1)
Sequence program is read.
Reading is complete.
(Touch)
To the following page
6) "Completed" is displayed.
Exit Ladder Break Menu READ STATE
NETWORK NO.0 PLC NO.FF
PARAM PROG CMNT EX.CMNT
READ SELECTION READ PROGRAM COMMENT
MAIN PROGRAM 1 SUB PROGRAM 2 (A4U) SUB PROGRAM 3 (A4U)
SETTING NON SETTING
← →: SWITCH ↑↓: SEL ↵: SET
2)
Change screen.
Exit : Moves to screen where ladder monitor function starts.
Ladder : Moves to ladder monitor screen.
PLCRD. : Moves to PLC read screen.
*1 Data being entered can be cleared by the following keys.
AC : Clears all data being entered to the object area.
DEL: Clears one character at the cursor position.
POINT
Once this data has been read from the PLC, it does not need to be read again. If data for screens created by the user is downloaded from the computer after this data has been read, however, the data will have to be read again.
(2) When the MELSEC-Q/QnA ladder monitor is executed [Operation procedure]
1) Touch the ladder monitor starting touch switch on the monitor screen prepared by the user or touch the LADDER MON. on the utility screen to start the ladder monitor function.
2) The key window is displayed. Set the network No./station No.
/CPU No.*1 of the applicable PLC CPU with the following keys.
: Select the input area.
Alphanumeric : Input the network No. and the station No.
AC : Clear all input data to the applicable area.
DEL : Clear one character at the cursor position.
: Define the input.
*1 Displayed for MELSEC-Q ladder monitor only.
*2 The monitor target must be preset using GT Designer2.
For MELSEC-A ladder monitor, specify the network number/station number set on GT Designer2.
Refer to the GOT-A900 series User's Manual (GT Works2 Version1/GT Designer2 Version1 compatible Connection System Manual) for details of the monitor target setting for Ethernet connection.
To the following page
3) The PLC read screen appears.
First, touch the Set Up key to display the setting window.
POINT
If ROM_BIOS is not installed, an error message is displayed. Touch the END button and install the ROM_BIOS (H version or later).
POINT
Designate the network No./ the station No. and CPU No.*1 of the applicable PLC CPU.
(For CC-Link system) Network No. : 0
Station No. : 0 (mask station) (For network system)
Network No. : 1 to 255 (self-loop) Station No. : 1 to 64 (control station)
1 to 64 (normal station) (For Ethernet connection)*2
Network No. : 1 to 239 Station No. : 1 to 64 (For multi-CPU system)
CPU No. :0 to 4 (CPU number)
4) The setting window appears.
Make the setting for initial ladder monitor start.
Touching the MEMORY key changes the setting choice as indicated below.
DISPLAY USE OF EXISTING DATA, SELECT USE OR CLEAR.
CLEAR EXISTING DATA.
USE OF EXISTING DATA.
After the setting is over, touch the button.
From the previous page
To the following page
5) Then, touch the Drive key to select the drive (applicable memory) which stores the applicable ladder data to be monitored.
6) The Drive Selection Window is displayed. Select the drive (applicable memory) with the following keys.
0 to 4 : Input the drive number.
AC : Clear all input data on the drive.
: Define the input.
7) The file list of the selected drive is displayed. Select the ladder to be read with the following keys.
: Move the cursor upward.
: Move the cursor downward.
Page : Display the previous page.
Page : Display the next page.
SEL. : Move the cursor and touch the key to change select (*)/cancel.
READ : Start reading the selected ladder.
8) Contents and capacity of the reading process are displayed.
Touch Break to stop the reading process.
To read the ladder again, start from the beginning.
From the previous page
9) When the message "Completed" is displayed, reading is completed. Change the screen with the following keys.
Exit : Move to the screen when the ladder monitor is started.
Ladder : Move to the ladder monitor screen.
Menu : Start from setting window (2) for the network No./station No.
POINT
• MELSEC-Q ladder monitor
When a password is registered at the PLC CPU, a file
password window is displayed at the start of reading. Input the password. (It does not have to be input if it is not registered.)
• MELSEC-QnA ladder monitor
When a keyword is registered at the PLC CPU, a key window is displayed at the start of reading. Input the keyword.
(It does not have to be input if it is not registered.)
POINT
Once PLC reading is performed, operations for PLC reading are not required from the next time onward.
6.2.2 Ladder read operation
This section describes the object sequence program of the ladder monitor that is read from the PLC CPU, for the operation displayed on the ladder monitor screen.
[Operation procedure]
Exit PLCRD. Mon. Menu
Exit PLCRD. Mon. Menu
Dev.Sea.
The ladder read operation is executed.
Dev.Sea. Cont.Sea. Coil.Sea.
(When entering device name) (When entering device No.)
: Select input area.
Alphanumeric: Enter device name and device No.
(*1) (Touch)
* When there is a at the upper left of the screen, touch it to return to the original screen.
When the screen below is currently displayed, it is not necessary to touch this.
When specifying and reading the device, contact point or coil used in the program (*4)
(Touch any of these.)
Move to ladder monitor screen (*2) 1)
7 4 1 0
8 5 2
− 9 6 3
A C E AC
B D F DEL [ ] STEP
Step.Sea.
When specifying and reading the step number in the program.
1)
(Touch)
0 to 9 : Input step No. (*1)
(Touch: Input confirmation)
Move to ladder monitor screen
When specifying and reading the final ladder in the program.
End.Sea.
(Touch)
Move to ladder monitor screen
*1 Data being entered can be cleared by the following keys.
AC : Clears all data being entered to the target area.
DEL : Clears one character at the cursor position.
*2 When specifying and reading a device, contact point or coil used in the program, the search targets all programs starting from the step number displayed on the previous ladder monitor screen, to the program immediately previous to the one displayed.
After moving to the screen monitor screen, continuous reading by the same device is enabled by touching on the screen.
If you touch any other key but , the continuous read function is canceled.
*3 When device search, contact point search, or coil search is performed during ladder monitoring, only the ladder block which includes the read search device is
displayed.
Example) 1) When the device name to be searched is entered as "X0001"
X0001 10
STEP : 12345/18374
X0002
Y0025 14
Print Screen
Cancel print
Exit PLCRD. Mon. Menu
<Ladder monitor screen>
Displayed in the top area.
List
2) When the same search is repeated
X0001 10
STEP : 12345/18374
X0002
Y0025 14
X0001
107 Y0030
Y0040 X0002
Print Screen
Cancel Print
Exit PLCRD. Mon. Menu
<Ladder monitor screen>
Displayed on the next line.
List
*4 Please note that the indirect specification device (index register (z)) cannot be specified and read while the MELSEC-QnA ladder monitor is executed.
6.2.3 Using the defect search
The defect search enables you to examine an ladder block that caused a failure. It helps you to search from the ladder block backward so that you can determine why any coil was turned ON or OFF during the ladder monitoring, or whether its contact is conductive or nonconductive.
POINT
While the MELSEC-QnA ladder monitor is performed, the factor search function cannot be used.
(The touch key of Fact.Sea. is not displayed.) [Operation procedure]
(1) Search for and display a ladder block where a failure occurred.
Example: When a valve connected to Coil Y0030 does not operate properly, begin searching for Coil Y0030 and view its ladder block on the screen.
(2) Touch Mon. to start the ladder monitoring.
(3) Touch Menu and then select Fact.Sea. from among options that appear on-screen.
If you touch Fact.Sea. without executing the ladder monitor function, operation changes depending on the type of the ladder monitor used.
For MELSEC-A ladder monitor: The "No MONITORING"
message appears and the following operation cannot be performed.
(Operation is enabled after execution of monitor.) For MELSEC-Q ladder monitor: Monitor is executed
automatically and the following operation is enabled.
After termination of a defect search, monitor stops automatically with the search result retained. Exit PLCRD. Mon. Menu
M130 M131 Exit PLCRD. Mon. Menu
Cancel
(Specify a device name) (Specify a device number)
M
(4) Another dialog box where you can specify a device name or device number is displayed on-screen. Specify any contact of which coil is not turned ON as a search device.
Example: Specify "M120" as the search device.
: Used to select a data entry field.
Alphanumeric : Used to enter a device name or device number. *1
: Used to stop the defect search, returning to the ladder monitor screen.
*1 Use the following touch keys if you want to delete any data entry:
AC : Clears all the data entered in a specific field.
DEL : Clears one character at the cursor position.
(5) Start searching for a device that caused a failure and view search results on the ladder monitor screen. Search from the last step number backward as displayed on the ladder monitor screen.
Please note that any touch keys other than Esc and Exit are enabled until the defect search is completed.
[Search results]
Search results reveal any occurrences of the search device. They are useful when you determine whether a defective device is conductive or nonconductive.
If any occurrence of the search device is not found as a result of the search, a message appears on-screen, telling that "PROGRAM NOT FOUND."
(1) When an occurrence of the search device is found:
If an occurrence of the search device is found as a result of the search, the search for another defective device will automatically be started.
Example: After searching for Device M120 that is in the OFF state, "M669" will be displayed as a device that caused a failure.
After searching for Coil M120 that is in the OFF state,
"M669" is displayed as a device that is not conductive.
Example: M669L
* After searching for a device that is in the ON state, a device that is conductive is displayed. The entire field of the device name and number is highlighted on-screen.
Example: M6691
A search for another defect is repeated.
M
54 M120
X0025
STEP : 63/ 932
Print Screen
Cancel Print
Exit PLCRD. Mon. ESC
* 6699
18 M669
M115 M1119
List M
54 M120
X0025
STEP : 63/ 932
Print Screen
Cancel Print
Exit PLCRD. Mon. ESC
* 6699
List
After searching for Coil M669 that is in the OFF state,
"M111" is displayed as a device that is not conductive.
Example: M1111
(2) When two occurrences of the search device are found.
If there are two or more devices that caused a failure, the "the defect search is interrupted" message appears and the defect search is terminated.
Example: After searching for Device M120 that is in the OFF state, "M669" and
"X0025" will be displayed as devices that caused a failure.
M
54 M120
STEP : 63/ 932
Print Screen
Cancel Print Exit PLCRD. Mon. ESC
* 6699
X0025
the defect search is interrupted.
List
After searching for Coil M120 that is in the OFF state, "M669" and
"X0025" are displayed as devices that are not conductive.
Example: M669L, X0025
* After searching for a device that is in the ON state, devices that are conductive are displayed. The entire field of the device name and number is highlighted on-screen.
Example: M6691, X0025
When resuming the defect search, specify either of the found contacts M669 and X0025.
(After touching Esc to change it into Menu, execute the defect search.)
(3) Precautions for making defect search
(a) If a B-contact is found defective as a result of the defect search, a search for the cause of the ON/OFF state will be automatically switched.
(b) After the end of the defect search, the GOT stops monitor and displays the search result.
Hence, the monitor screen of the GOT shows the result retained during the defect search.
(c) While the search result is displayed after the end of the defect search, the searched ladder can be displayed backwards by pressing (single ladder block scroll) or JUMP JUMP (10 ladder block jump (available for only the MELSEC-Q ladder monitor function)).
Up to 100 ladders can be displayed on-screen. The following messages will appear at the start or the end of the search results.
• When viewing the start of search results: "This is the start of search results."
• When viewing the end of the search results: "This is the end of search results."
(d) The ON/OFF of the contact and coil is displayed as described below.
1) During automatic search execution
MELSEC-A ladder monitor: Displays ON/OFF in the entire ladder displayed on the screen.
MELSEC-Q ladder monitor: Displays ON/OFF in the ladder displayed last.
2) During search result display
The ON/OFF of the ladder block searched last and the monitor results of word devices are displayed.
(e) When the defect search starts, Menu changes into Esc .
Touch Esc during the defect search to stop the defect search and display the search result.
Further, touch Esc to change Esc into Menu and display the normal ladder.
(f) The screen during the defect search operates as described below.
1) If the display data exceeds one screen during the defect search The screen is scrolled automatically.
2) If the ladder step searched during the defect search exceeds one screen MELSEC-A ladder monitor: The screen is scrolled automatically to the last
line of the ladder step.
MELSEC-Q ladder monitor: The screen is not scrolled automatically to display the ladder step.
(g) Touching Esc can stop the defect search. Search results are continuously displayed on-screen until Esc is touched.
The ladder step searched last is displayed as described below.
• MELSEC-A ladder monitor: ON/OFF display is not provided.
• MELSEC-Q ladder monitor: ON/OFF display is provided.
6.2.4 Touch search operation
A touch search is the function designed to search for the coil of a device when its contact displayed in the ladder monitor is touched and to search for the contact of a device when its coil is touched.
A search can be made from the beginning of a ladder to its last step.
This function is always valid when a normal ladder is displayed.
POINT
• The touch search function cannot be used when MELSEC-A/FX/QnA ladder monitor is executed.
• The function cannot be used for instructions other than contacts and coils and for word devices.
• When the defect search function is in use, the touch search function cannot be used.
(Touch Esc to terminate the defect search.) [Operation procedures (when contact is touched to search for coil)]
M120
Exit PLCRD. Mon. Menu Sea.
Back
Print Screen
Cancel
Print JUMP JUMP
(1) Touch the contact on the ladder monitor screen.
X0001
Exit PLCRD. Mon. Menu BackSea.
Print Screen
Cancel
Print JUMP JUMP
(2) The coil of the device whose contact was touched is searched for, and the single ladder block including the coil found is added to the display.
(The found device is highlighted.)
STEP : 67/ 932
Exit PLCRD. Mon. Menu Sea.
Back Print
Screen
Cancel
Print JUMP JUMP T0
(3) Touch to search the ladder downward continuously.
[Operation procedures (when coil is touched to search for contact)]
Exit PLCRD. Mon. Menu Sea.
Back
Print Screen
Cancel
Print JUMP JUMP
(1) Touch the coil on the ladder monitor screen.
M231
Exit PLCRD. Mon. Menu Sea.
Back
Print Screen
Cancel
Print JUMP JUMP
(2) The contact of the device whose coil was touched is searched for, and the single ladder block including the contact found is added to the display.
(The found device is highlighted.)
STEP : 67/ 932
Exit PLCRD. Mon. Menu Sea.
Back
Print Screen
Cancel
Print JUMP JUMP M231
(3) Touch to search the ladder downward continuously.
6.2.5 Changing from one screen to another
This section describes the screen movements when executing the ladder monitor from the status where the user-created monitor screen is displayed.
Start
User-created monitor screen
Utility screen
Ladder monitor screen (see Sec. 6.3)
Ladder read screen (see Sec 6.2.2)
PLC read screen (see Sec. 6.2.1)
*1 Touch the key where the touch switch (expanded) function was set with the GT Designer2, and start the system monitor function.
When the Utility screen is displayed, touch LADDER MON. to start the system monitor function.
The system monitor function and special module monitor function can also be started from the Utility screen.
(*1)
Touch
Touch Exit Touch LADDER MON.
Touch PLCRD.
Touch Ladder
Touch / End. Sea. Touch Menu (*1)
Dev.Sea.
Cont.Sea.
Coil.Sea.
16/32Bit 10/16Dec.Hex.
Test Step.Sea.
End. Sea.
Fact.Sea. Cmnt.
6.3 Ladder monitor
The ladder monitor screen display and the keys that are shown at the top of the screen are explained in this section.
6.3.1 Ladder monitor screen display and key functions
6.3.1 Ladder monitor screen display and key functions