Diagnostics Alarms - Siemens SIMATIC ET 200SP Manual

7.3

Diagnostics alarms

A diagnostic alarm is output for each diagnostics event and the DIAG LED on the module
flashes. The diagnostic alarms can, for example, be read from the diagnostic buffer of the CPU.
You can evaluate the error codes with the user program.
Table 7-5 Diagnostics alarms, their meanings and corrective measures
Diagnostics alarm
Overflow
Underflow
Error
No load voltage
Channel temporarily
unavailable
Hardware interrupt lost 16
Short circuit / wire
break at sensor
Error in input circuit
Invalid/inconsistent
firmware
Channel/component
temporarily unavailable
Analog input module AI 2xSG 4-/6-wire HS (7MH4134-6LB00-0DA0)
Manual, 09/2018, A5E41867508A-AB
Error code Meaning
7 The value is above the overrange.
H
8 Value is below the underrange.
H
9 Internal module error has occurred (diag‐
H
nostic alarm on channel 0 applies to the en‐
tire module).
11 No or insufficient supply voltage L+
H
1F Update of the firmware is being performed
H
or has been canceled.
The module does not read any process val‐
ues in this state.
Hardware interrupt queue is full
H
124 Short circuit at the sensor supply (UVn +/-)
H
or wire break at the reference voltage input
(URn +/-). Wire break can only be detected
with 6-wire sensors.
313 A/D converter is faulty
H
11B Module-internal checksum error
H
103 Restart due to watchdog reset
H
Interrupts/diagnostics interrupts
7.3 Diagnostics alarms
Solution
Correct the output value
Correct the output value
Replace the module
● Check supply voltage L+ on the
BaseUnit
● Check BaseUnit type
● Wait for firmware update
● Restart the firmware update
-
Check wiring and correct, if necessary
● Check EMC-compliant wiring in
case of recurring message
● Replacement of the module
Replace the module in case of recur‐
ring message
Replace the module in case of recur‐
ring message
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