Diagnostics for digital modules

4.4 Diagnostics for digital modules

4.4.1 General information about diagnostic messages

Programmable and non-programmable diagnostic messages

Using the diagnostics function, we make a distinction between programmable and non-programmable diagnostic messages.

You only obtain programmable diagnostic messages if you have enabled the diagnostics using the relevant parameters. You perform parameter assignment in the "Diagnostics" tab in STEP 7, see section 6.7.

Digital modules always return non-programmable diagnostic messages, irrespective of diagnostics being enabled.

Reactions to diagnostic messages in STEP 7

Actions initiated by diagnostic messages:

● The diagnostic message is entered in the diagnostics of the digital module, forwarded to the CPU and can be read out by the user program.

● The fault LED on the digital module lights up.

● If you have set "Enable diagnostic interrupt" in STEP 7, a diagnostic interrupt is triggered and OB 82 is called, see section 5.5.

Reading diagnostic messages

You can read detailed diagnostic messages using SFCs in the user program (refer to the appendix "Diagnostic data of signal modules").

You can view the cause of the error in STEP 7 in the module diagnostics (refer to the online help for STEP 7).

Diagnostics using the INTF and EXTF LEDs

Some digital modules indicate faults by means of their two fault LEDs INTF (internal fault) and EXTF (external fault). The LEDs go out when all the internal and external faults have been eliminated.

Refer to the specifications of the modules beginning with section 5.7 to find out which digital modules have these fault LEDs.

See also

General information about parameter assignment (Page 216) Interrupts of the digital modules (Page 103)

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Digital modules

4.4 Diagnostics for digital modules

4.4.2 Diagnostic messages of the digital modules

Overview

The table below gives an overview of the diagnostic messages for the digital modules with diagnostics capability.

You can find out which diagnostic message each module is capable of in the Appendix entitled "Diagnostic data of the signal modules".

Table 4- 6 Diagnostic messages of the digital modules

Diagnostic message LED Scope of diagnostics Programmable

Module error INTF/EXTF Module No

Internal error INTF Module No

External error EXTF Module No

Channel error INTF/EXTF Module No

External auxiliary voltage missing EXTF Module No

Front connector missing EXTF Module No

No module parameters INTF Module No

Incorrect parameters INTF Module No

Channel information available INTF/EXTF Module No

STOP mode - Module No

Internal voltage failure INTF Module No

EPROM error INTF Module No

Hardware interrupt lost INTF Module No

Parameter assignment error INTF Channel No

Short-circuit to M EXTF Channel Yes

Short-circuit to L+ EXTF Channel Yes

Wire break EXTF Channel Yes

Fuse blown INTF Channel Yes

Sensor supply missing EXTF Channel/channel

group Yes

Load voltage L+ missing EXTF Channel/channel

group Yes

Note

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Digital modules 4.4 Diagnostics for digital modules

4.4.3 Causes of errors and remedies for digital modules

Overview

Table 4- 7 Diagnostic messages of the digital modules, causes of errors and remedies

Diagnostic message Possible cause of error Remedy

Module error Any, the module has detected an

error. -

Internal error Module has detected an error within the automation system. - External error Module has detected an error

outside of the automation system. - Channel error Indicates that only certain channels

are faulty. -

External auxiliary

voltage missing Voltage required to operate the module is missing (load voltage, sensor supply).

Supply missing voltage

Front connector

missing Jumper between connections 1 and 2 in the front connector is missing.

Install jumper

No module

parameters Module requires information whether it should operate with default system parameters or with your parameters.

Message queued after power-on until parameter transmission by the CPU has been completed; configure the module, as required.

Incorrect parameters One parameter, or the combination

of parameters, is not plausible. Reassign parameters to the module Channel information

available Channel error; module can provide additional channel information. - STOP mode No parameters have been

assigned to the module and the first module cycle has not been completed.

If after rebooting the CPU all the input values are in the intermediate memory, this message is reset.

Internal voltage failure Module is defective Replace the module EPROM error Module is defective Replace the module Hardware interrupt

lost The module cannot send an

interrupt, since the previous interrupt was not acknowledged;

possible configuration error.

Change the interrupt handling in the CPU (change priority for interrupt OB;

shorten interrupt program).

Parameter

assignment error Incorrect parameters transferred to the module (for example,

impossible input delay); the corresponding channel is deactivated.

Reassign parameters to the module

Overload at output Eliminate overload Short-circuit to M

Short-circuit of output to M Check the wiring of the outputs.

Short-circuit to L+ Short-circuit of output to L+ Check the wiring of the outputs.

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4.4 Diagnostics for digital modules

Diagnostic message Possible cause of error Remedy

Lines interrupted Connect the cable

No external sensor supply Wire sensors with10 to 18 kΩ.

Disable the "Diagnostics – Wire break"

parameter for the channel in STEP 7.

Wire break

Channel not connected (open)

Wire the channel Fuse blown One or more fuses on the module

has blown and caused this fault. Remove the overload and replace the fuse.

Overload at sensor supply Eliminate overload Sensor supply

missing Short-circuit of sensor supply to M Eliminate the short-circuit.

Power supply L+ to module

missing Feed in supply voltage L+.

Load voltage L+

missing

Fuse in module is defective Replace the module

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