Interrupts; Diagnostics Alarms - Siemens SIMATIC ET 200SP Manual

5.2

Interrupts

The DI 8×24VDC ST digital input module supports diagnostic interrupts.
Diagnostics interrupt
The module generates a diagnostics interrupt for the following events:
● Short-circuit
● Wire break
● Parameter assignment error
● No supply voltage
5.3

Diagnostics alarms

A diagnostic alarm is generated and the DIAG-LED flashes on the module for each
diagnostics event. You can read out the diagnostics alarms, for example, in the diagnostics
buffer of the CPU. You can evaluate the error codes with the user program.
Table 5- 4 Diagnostics alarms, their meaning and how to deal with them
Diagnostics alarm Error code
Short-circuit 1
H
Wire break 6
H
Parameter assign- 10
ment error
No supply voltage 11
Digital input module DI 8x24VDC ST (6ES7131-6BF01-0BA0)
Manual, 09/2017, A5E03574157-AE
Meaning
Short-circuit to ground at encoder supply
Impedance of encoder circuit too high.
Wire break between the module and sen-
sor
Channel not connected (open)
The module cannot evaluate parame-
•
H
ters for the channel.
Incorrect parameter assignment.
•
No or insufficient supply voltage L+
H
Interrupts/diagnostics alarms
Remedy
Correct the process wiring
Use a different encoder type or modify
the wiring, for example, using cables with
larger cross-section
Connect the cable
Disable diagnostics
•
Connect a resistor of 25 kilohms to
•
45 kilohms to the encoder contacts
Correct the parameter assignment
Check supply voltage L+ on the Ba-
•
seUnit
Check BaseUnit type
•
5.2 Interrupts
23