DIAG Output
The DIAG output provides non fail-safe information on errors for service purposes.
You can read this out using the operator control and monitoring system or evaluate
it in your standard user program. The DIAG bits remain stored until you
acknowledge at the ACK input.
Structure of DIAG
Bit no. Meaning Possible causes of problems Remedies
Sensor defective Check sensors
Wiring fault Check wiring of sensors
F-I/O error, channel error, or
communication error*
Remedy see manual, Section
5.3.2, Bits 0 to 6 in Table
"Structure of DIAG"
Discrepancy time set too low Set higher discrepancy time
Bit 0 Discrepancy error or bad
discrepancy time set
(= state of DISC_FLT)
Discrepancy time < 0 or
> 60 s set
Set discrepancy time in range
0 through 60 s
Bit 1 If discrepancy error: Last signal
state change was at input IN1
- -
Bit 2 If discrepancy error: Last signal
state change was at input IN2
- -
Bit 3 Reserved - -
Bit 4 Reserved - -
Acknowledgment button
defective
Replace acknowledgment
button
Bit 5 If discrepancy error: Input ACK
has permanent signal state 1
Wiring fault Check wiring of
acknowledgment button
Bit 6 Acknowledgment necessary
(= state of ACK_REQ)
- -
Bit 7 State of output Q - -
* If the sensors at inputs IN1 and IN2 are assigned to different F-I/Os, a discrepancy error can also occur because one
of the F-I/Os outputs substitute values (QBAD in the relevant F-I/O DB = 1).
Note
Access to the DIAG output is not permitted in the safety program!
Product Information for the S7 Distributed Safety, Configuring and Programming Manual
52 A5E00169432-02
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