date:23.10.2015 file:pro1_12e.1 simatic s7 siemens ag 1999. all rights reserved. information and...

Date: 21.04.23File: PRO1_12E.1

SIMATIC S7Siemens AG 1999. All rights reserved.

Information and Training CenterKnowledge for Automation

Troubleshooting




System Diagnostics - Overview

PG 740

SIEMENS

CPU I/O-ModuleCPU diagnostics detectsa system error

CPU diagnostics detectsan error in the user program

Error OB

Diagnosticbuffer

CPUmessages

Diagnostics-capable moduledetects anerror andgenerates adiagnosticinterrupt

Diagnosticinterrupt

Systemstatus list

SFC




Searching for Errors, that Cause the CPU to Stop

CPU




Calling the "Module Information" Tool




Module Information Tab: "Diagnostic Buffer"




Interpreting Error Messages




Opening a Block Containing an Error




Diagnostics with I Stack, B Stack, L Stack

Program structure Block containing error

Error location

You see the contents of the accumulators, registers, status wordetc. (up to time of interruption) in the I Stack.

You see the values of thetemporary variables up to time of interruption in the L Stack.

Error location

You see the blocks executed up to the error in the B Stack.




B Stack

Date: 21.04.23File: PRO1_12E.10



I Stack

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L Stack

Date: 21.04.23File: PRO1_12E.12



Exercise: Finding Stop Errors and Eliminating Them

ResultWhat to DoStep

The CPU memory is reset. Carry out a CPU memory reset.1

Copy the S7 program "ERROR" from the project "ERROR _16" ("ERROR _32") into the HW-Station "My Station".

The project structure is displayed.2

The faulty program is downloaded.Download all the blocks from the S7 program "ERROR" into the CPU.3

The CPU goes into STOP mode.Perform a complete restart.4

The CPU remains in RUN.Find and eliminate the errors,that lead to the Stop state.5

Date: 21.04.23File: PRO1_12E.13



Exercise: Troubleshooting with I Stack, B Stack

ResultWhat to DoStep

The CPU goes into STOP once more.Switch on the inputs I 1.0 to I 1.2 in sequence.1

Answer the questions in the tablebelow.

Clarify the cause of the error with thehelp of the diagnostic buffer and the Stacks.

2

The CPU remains in RUN.Switch the inputs I 1.0 to I 1.2 off again.3

Date: 21.04.23File: PRO1_12E.14



Logical Errors

??

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Displaying Reference Data

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Filtering Reference Data

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Cross References

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Filtering Cross References

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Reference Data: Find

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Block Correction using Cross References

2x

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Go to Location

1xright

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Assignment of I,Q,M,T,C

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Unused Symbols / Addresses without Symbols

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Program Structure

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Comparing Blocks (1)

...see next page

Date: 21.04.23File: PRO1_12E.26



Comparing Blocks (2)

Date: 21.04.23File: PRO1_12E.27



Exercise: Eliminating Logical Program Errors

• Can you select the "Manual" mode?

• Can the conveyor belt be traversed in jog mode?

• Switch on the Automatic mode !

• Does the bottle stop at the bottle sensor for filling?

• Is there a message when the minimum level was exceeded?

• Is the number of packaging units displayed on the digital display?

Date: 21.04.23File: PRO1_12E.28



Sporadic Errors

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Displaying CPU Messages

Date: 21.04.23File: PRO1_12E.30



Writing User Messages in the Diagnostic Buffer

SEND =TRUE

1 2

Send buffer

Diagnostic buffer

Sending asynchronousto user program

Node

e.g. PG, OP

CPU

SFC 52

Date: 21.04.23File: PRO1_12E.31



Configuring Your Own Message Texts

Date: 21.04.23File: PRO1_12E.32



Calling the SFC 52 Block

Network 2: User message when limit value exceeded

ENO

RET_VAL #error_sfc52

SFC 52

EN

SEND

EVENTN

INFO 1

INFO 2#analog value_normalized

#dummy

W#16#A901

M 0.1

M 0.1

P

#analog value_normalized

5.000000e+003

CMP>R

IN1

IN2

>=1

M 90.1

Date: 21.04.23File: PRO1_12E.33



Structure of the EVENTN Parameter of the SFC 52 Block

Event class

15 14 13 12EVENTN

1..9 are standard texts for the different events (see the Standard and System Functions manual)

A..B free texts, that are specified using Message Configuration

C..F reserved for expansions in the future

Event class

11 10 9 8

Identification

Specifies if it is an incoming or an outgoing event, or, an internal or an external event, for example:

Bit 8= "1" --> incoming messageBit 8= "0" --> outgoing messageBit 10= "1" --> internal faultBit 11= "1" --> external fault

Identification

7 6 5 4 3 2 1 0

Event number

Continuous message number from 1 to 255 within an event classEvent number

Date: 21.04.23File: PRO1_12E.34



Diagnostics-Capable Modules

Assigning parameters for a diagnostics-capable module:

... trigger a diagnostics interrupt OB 82 when an error occurs

Date: 21.04.23File: PRO1_12E.35



Displaying Hardware Diagnostics in the SIMATIC Manager

2x

Date: 21.04.23File: PRO1_12E.36



Exercise: Enabling Diagnostic Messages

Date: 21.04.23File: PRO1_12E.37



Exercise: Outputting User Messages

SFC 52

SEND

EVENTN

INFO1

INFO2

RET_VALTRUE

W#16#9101

MW 54

MD 56

MW 52

???*

*

* a contact must be connected to the EN for programming in LAD !

EN

Date: 21.04.23File: PRO1_12E.38



Exercise: Enabling Diagnostic Interrupts and Simulating Hardware Faults

Step What to Do Result

Enable the diagnostic interrupt at the analog module ! (HW Config.)1

The hardware diagnostic is activated

2 Download the configuration in the CPU

3 Remove the front connector on the analog module !

The "SF" LED on the analog moduleindicates a hardware fault

4 The configuration is opened onlineActivate the "Diagnose Hardware" tool !

5 The message "Power supply failure" is given as the cause of the error

Clarify the cause of the error with the tool !

Date: 21.04.23File: PRO1_12E.39



System Information

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System Information - Overview

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Module Information: "Memory" Tab

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Module Information: "Scan Cycle Time" Tab

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Module Information: "Time System" Tab

... in the SIMATIC Manager:PLC -> Set Date and

Time

Date: 21.04.23File: PRO1_12E.44



Module Information: "Performance Data" Tab

... in the SIMATIC Manager:• Blocks folder-> Properties

Date: 21.04.23File: PRO1_12E.45



Performance Data: Blocks

Date: 21.04.23File: PRO1_12E.46



Exercise: Reading Out System Information

date:23.10.2015 file:pro1_12e.1 simatic s7 siemens ag 1999. all rights reserved. information and...

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