3 Special functions of a CPU 41x
4.7 Web server
4.7.5 Web pages
4.7.5.4 Module state
Module state
The status of a station is displayed on the "Module state" page using symbols and comments.
Note
"Report system error"
• Duration of display: Depending on the plant configuration, the display "Report system error" may take some time to create the startup evaluation of the state of all the configured I/O modules and I/O systems. There is no concrete display of the status on the "Module state" page during this time. A "?" is displayed in the "Error" column.
• Dynamic response: "Report system error" must be called cyclically at least every 100 ms.
The call may either take place in OB 1, or if the cycle time is more than 100 ms in the cyclic interrupt OB 3x (≤ 100 ms) and in the restart OB 100.
• Deactivated stations: Activating and deactivating stations does not result in an update of the module state.
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Communication 4.7 Web server
Figure 4-12 Module state
Meaning of symbols
Symbol Color Meaning green Component OK
black Component not available/ unable to determine state
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Communication 4.7 Web server
Navigation to other module levels
The state of individual modules is displayed when you navigate to further module levels:
● Go to the next higher module level using the link in the title line
● Go to the next lower module level using the link in the name
Figure 4-13 Module state
Requirement
The Web server is activated, languages are set, and the project is compiled and downloaded in STEP 7.
Note
State of the AS-i slaves
The state of AS-i slaves is not displayed on the "Module state" page. Only the state of the AS-i link is displayed.
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Communication 4.7 Web server
① "Module state"
The table contains information about the rack, the nodes, the DP master system and the individual modules of the station relating to the selected level.
The requirement for this is that the function "Report system errors" has been configured for the CPU or the station and that the modules generated have been loaded in the CPU.
② "Title line"
The link in the title line takes you to the "module state" of the next higher module level.
③ "Details"
The "Details" link provides you with information on the selected module in the "Status" and
"Identification" tabs.
④ "Status" tab
The tab contains information on the status of the selected module:
⑤ "Identification" tab
The tab contains data on the identification of the selected module.
⑥ "Filter"
You can sort the table by certain criteria.
Use the pulldown list to view only the entries of the selected parameter. Enter the value of the selected parameter in the input box and then click "Filter".
1. Select, for example, the parameter "Symbol" in the pulldown list.
2. Click "Filter".
The filter criteria are also retained when you update a page.
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Communication 4.7 Web server 4.7.5.5 Alarms
Messages
The browser displays the content of the message buffer on the Messages Web page.
The messages cannot be acknowledged on the web server.
Figure 4-14 Messages
Requirements
The message texts were configured in the user-specific languages. For information about the configuration of message texts, refer to STEP 7 and to the Internet address
http://support.automation.siemens.com/WW/view/en/23872245
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Communication 4.7 Web server
① Filter
This functionality allows you to select specific information from this page.
Use the corresponding list to view only the entries of the selected parameter. Enter the value of the selected parameter in the input box and then click "Filter".
To view all alarms with "incoming" status, for example:
1. Select the "Status" parameter from the list.
2. Enter the "incoming" text in the input box.
3. Click "Filter".
The filter criteria are also retained when you update a page.
② Messages
CPU messages are displayed in chronological order, including the date and time.
The message text parameter is an entry which contains the message texts configured for the corresponding fault definitions.
Sorting
You can also view the parameters in ascending or descending order. Click in the column header of one of the parameters.
● Message number
● Date
● Time
● Message Text
● State
● Acknowledgment
The messages are returned in chronological order when you click the "Date" entry. Incoming and outgoing events are output at the Status parameter.
③ Message number details
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Communication 4.7 Web server
4.7.5.6 PROFINET
"Parameters" tab
The"Parameters" tab ① of this Web page contain a summary of information about the integrated PROFINET interface of the CPU.
Figure 4-15 Parameters of the integrated PROFINET interface
② Network connection
This page displays information for the identification of the integrated PROFINET interface of the corresponding CPU.
③ IP parameters
Information about the configured IP address and number of the subnet in which the corresponding CPU is networked.
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Communication 4.7 Web server
④ Physical properties
You can find the following information in the "Physical properties" field:
● Port number
● Link status
● Settings
● Mode Note
Updating data
The data you see in the HTML browser are only automatically updated if you activated automatic update in HW Config. Otherwise, you can view the current data by updating the view in the HTML browser at regular intervals (Update button).
"Statistics" tab
Information about the quality of data transfers is available in the ① "Statistics" tab.
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Communication 4.7 Web server
② Data packets since
This shows the time at which the first data packet was sent or received.
③ "Total statistics - Data packets sent"
The quality of the data transmission on the transmission line can be determined from the key figures in this info box.
④ "Total statistics - Data packets received"
The quality of the data transmission on the reception line can be determined from the key figures in this info box.
⑤ "Statistics Port 1/Port 2 - Data packets sent"
The quality of the data transmission on the transmission line can be determined from the key figures in this info box.
⑤ "Statistics Port 1/Port 2 - Data packets received"
The quality of the data transmission on the reception line can be determined from the key figures in this info box.
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Communication 4.7 Web server
4.7.5.7 Topology
Topology of the PROFINET nodes
The configured and non-configured but available PROFINET nodes of a station are displayed on the "Topology" page in a graphical and tabular view.
Both views can be printed out. Use your browser's print preview function before printing and correct the format if necessary.
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Communication 4.7 Web server
① Configured, available PROFINET nodes
The "Topology" page displays via which ports the configured and available PROFINET nodes of a station are connected.
② Non-configured and available PROFINET devices
Non-configured and directly available PROFINET devices ("adjacent stations") are displayed on the right.
③, ④ Configured, but unavailable PROFINET nodes
③ The configured, but unavailable PROFINET nodes are displayed in pink.
④ Nodes for which it is not possible to determine a neighbor relationship, e.g. also switches or PROFINET devices which do not support LLDP.
The PROFINET nodes can be identified by the device numbers in HW Config.
Topology - Tabular view
Figure 4-18 Topology - tabular representation
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Communication 4.7 Web server
Meaning of symbols
Symbol Meaning
Configured and available PROFINET nodes Non-configured and available PROFINET nodes Configured, but unavailable PROFINET nodes
Nodes for which a neighbor relationship cannot be determined.
4.7.5.8 Variable status
Variable status
The browser outputs the variable status on the Web page of the same name. You can monitor the status of up to 50 variables.
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Communication 4.7 Web server
① Address
Enter the address of the operand of which you want to monitor the response in the "Address"
text box. Invalid addresses entered are displayed in red font.
To retain these entries, save the variable status Web page in the Favorites list of your browser.
② Display format
Select the display format of a variable using the drop-down list. The program indicates the variable in hex code if it does not support the selected display format.
③ Value
Outputs the value of the corresponding operand in the selected format.
Special features when changing languages
You can change the language, for example, from German to English, by clicking the object in the upper right corner. The German mnemonics differ compared to other languages. The syntax of operands you enter may be invalid for this reason when you change languages.
For example, ABxy instead of QBxy. The browser outputs a faulty syntax in red font.
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Communication 4.7 Web server 4.7.5.9 Variable tables
Variable tables
The browser displays the content of the variable tables on the Web page of the same name.
You can monitor up to 50 variable tables with a of maximum 200 variables.
Figure 4-20 Variable tables
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Communication 4.7 Web server
④ Value
This column shows the values in the corresponding display format.
⑤ Comment
The program outputs the comment you configured in order to highlight the meaning of an operand.
Creating a variable table for the Web server
1. Generate a variable table in STEP 7.
2. Open the properties dialog of the variable table and activate the "Web server" check box.
As an alternative, you can enter the ID "VATtoWEB" in the "Family" field.
3. Save and compile the project and download the configuration data to the CPU.
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PROFIBUS DP 5
5.1 CPU 41x as DP master / DP slave
5.1.1 Overview
Introduction
This section describes the properties and technical specifications that you will need when you use a CPU 41x as a DP master or DP slave and configure it for direct data exchange.
Declaration: The DP master / DP slave behavior is the same for all CPUs therefore the CPUs described below will be named CPU 41x.
Further Information
For information on the hardware and software configuration of a PROFIBUS subnet and on diagnostic functions within the PROFIBUS subnet, refer to the STEP 7 Online Help.
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PROFIBUS DP
5.1 CPU 41x as DP master / DP slave
5.1.2 DP address areas of 41x CPUs
Address Areas of 41x CPUs
Table 5- 1 41x CPUs (MPI/DP interface as PROFIBUS DP)
Address area 412-1 412-2 414-2 416-2
MPI interface as PROFIBUS DP, both inputs and outputs
(bytes) 2048 2048 2048 2048
DP interface as PROFIBUS DP, both inputs and outputs
(bytes) - 4096 6144 8192
Table 5- 2 41x CPUs (MPI/DP interface and DP module as PROFIBUS DP)
Address area 414-3 416-3 417-4
MPI interface as PROFIBUS DP, both inputs and outputs (bytes) 2048 2048 2048 DP interface as PROFIBUS DP, both inputs and outputs (bytes) 6144 8192 8192 DP module as PROFIBUS DP, both inputs and outputs (bytes) 6144 8192 8192
You can add all inputs and outputs to the process image of the CPU.
DP diagnostics addresses
In the input address area, the DP diagnostic addresses occupy at least 1 byte for the DP master and each DP slave. The DP standard diagnostics for each node can be called at these addresses, for example (LADDR parameter of SFC13). You specify the DP diagnostic addresses during project engineering. If you do not specify DP diagnostic addresses, STEP 7 assigns the addresses as DP diagnostic addresses in descending order starting at the highest byte address.
In the DPV1 master mode, the slaves are usually assigned two diagnostic addresses.
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PROFIBUS DP 5.1 CPU 41x as DP master / DP slave
5.1.3 CPU 41x as PROFIBUS DP master
Introduction
This section describes the properties and technical specifications of the CPU if you operate it as a PROFIBUS DP master.
Reference
You can find the features and technical specifications of the 41x CPUs as of in this manual in Technical specifications.
Requirement
You will need to configure the relevant CPU interface for use as a DP master. This means that you do the following in STEP 7:
1. Configure the CPU as a DP master 2. Assign a PROFIBUS address.
3. Select an operating mode (S7-compatible or DPV1).
4. Assign a diagnostic address.
5. Connect DP slaves to the DP master system.
Note
Is one of the PROFIBUS DP slaves a CPU 31x or CPU 41x?
If yes, you will find it in the PROFIBUS DP catalog as a "preconfigured station". Assign this DP slave CPU a slave diagnostic address in the DP master. Interconnect the DP master with the DP slave CPU, and define the address areas for data exchange with the DP slave CPU.
From EN 50170 to DPV1
The standard concerning distributed I/O (EN 50170) has been further developed. The results were incorporated into IEC 61158 / IEC 61784-1:2002 Ed1 CP 3/1. The SIMATIC
documentation refers to this as DPV1.
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PROFIBUS DP
5.1 CPU 41x as DP master / DP slave
DPV1 and EN 50170 compatibility
You can continue to use all existing slaves after the system conversion to DPV1. These do not, however, support the enhanced function of DPV1.
DPV1 slaves can be used in systems that are not converted to DPV1. In this case, their behavior corresponds with that of conventional slaves. SIEMENS DPV1 slaves can be operated in S7-compatible mode. For the DPV1 slaves of other manufacturers, you need a GSD file < Rev. 3 file to EN 50170.
Additional information
Information on migrating from EN 50170 to DPV1 is available on the Internet, on the FAQ pages "Changing from EN 50170 to DPV1", FAQ ID 7027576, on the Customer Support website.
http://www.siemens.com/automation/service&support
Status/modify, programming via PROFIBUS
As an alternative to the MPI interface, you can use the PROFIBUS DP interface to program the CPU or execute the status and modify functions of the programming device.
Note
The execution of programming and status and modify functions via PROFIBUS DP interface prolongs the DP cycle.
Constant bus cycle time
This is a property of PROFIBUS DP that ensures same length bus cycles. The "Constant bus cycle time" function ensures that the DP master always starts the DP bus cycle within a constant interval. From the perspective of the slaves, this means that they receive their data from the master at constant time intervals.
The constant cycle time (isochrone) PROFIBUS is the basis for "isochrone mode".
Isochrone mode
S7-400 CPUs support the mechanism of isochronous reading and outputting of I/O signals.
This allows the user program to synchronize with the I/O processing. Input data is then recorded at a set time and output data takes effect at a set time.
Full "terminal-to-terminal" support of isochrone mode is only possible if all components within the sequence support the "isochrone mode" system property.
The "Isochrone Mode manual contains a full overview of this system property.
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PROFIBUS DP 5.1 CPU 41x as DP master / DP slave
Isochronous updating of process image partitions
SFC126 "SYNC_PI" is used to isochronously update a process input image partition. A user program which is linked to a DP cycle can use the SFC to update the input data in the process input image partition consistently and synchronously with these intervals. SFC126 accepts interrupt control and can only be called in OBs 61, 62, 63 and 64.
SFC 127 "SYNC_PO" is used to isochronously update the process output image partition. An application program which is linked to a DP cycle can use the SFC to transfer the computed output data from a process output image partition to the I/O consistently and synchronously with these intervals. SFC127 accepts interrupt control and can only be called in
OBs 61, 62, 63 and 64.
To allow isochronous updates of process image partitions, all input or output addresses of a slave must be assigned to the same process image partition.
To ensure consistency of data in a process image partition, the following conditions must be satisfied on the various CPUs:
● CPU 412: Number of slaves + number of bytes / 100 < 16
● CPU 414: Number of slaves + number of bytes / 100 < 26
● CPU 416: Number of slaves + number of bytes / 100 < 40
● CPU 417: Number of slaves + number of bytes / 100 < 44
SFCs 126 and 127 are described in the corresponding Online Help and in the System and Standard Functions manual.
Consistent user data
Data that belongs together in terms of its content and describes a process state at a specific point in time is known as consistent data. To maintain consistency, the data should not be changed or updated during processing or transmission.
For a description, please refer to the section Consistent Data (Page 155).
Sync/Freeze
The SYNC control command is used to set sync mode on the DP slaves of selected groups.
In other words, the DP master transfers current output data and instructs the relevant DP slaves to freeze their outputs. The DP slaves writes the output data of the next output frames
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PROFIBUS DP
5.1 CPU 41x as DP master / DP slave
The DP master receives the current state of the inputs cyclically, again not until you have sent the UNFREEZE control command with SFC11 "DPSYC_FR".
For information on SFC11, refer to the corresponding online help and to the System and Standard Functions manual
Startup of the DP master system
Use the following parameters to set startup monitoring of the DP master:
● Transfer of the parameters to modules
● "Ready" message from the module
That is, the DP slaves must start up within the set time and be configured by the CPU (as DP master).
PROFIBUS address of the DP master
All PROFIBUS addresses are allowed.
See also
System and Standard Functions
(http://support.automation.siemens.com/WW/view/en/1214574)
Isochrone mode (http://support.automation.siemens.com/WW/view/en/15218045)
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PROFIBUS DP 5.1 CPU 41x as DP master / DP slave
5.1.4 Diagnostics of the CPU 41x as DP master
Diagnostics using LEDs
The following table explains the meaning of the BUSF LED. The BUSF LED assigned to the interface configured as the PROFIBUS DP interface will always light up or flash.
Table 5- 3 Meaning of the "BUSF" LED of the CPU 41x as DP master
BUSF Meaning Remedy
Off Configuration correct;
All configured slaves can be addressed
–
Lit • Bus fault (hardware fault)
• DP interface fault
• Different transmission rates in multi-DP master mode
• Check for short-circuit or interruption of the bus
• Check for short-circuit or interruption of the bus