Alarms; Diagnostics Alarms - Siemens SIMATIC Equipment Manual

5.3

Alarms

5.3.1

Diagnostics alarms

A diagnostics alarm is output for each diagnostics event. On the I/O device
DI 16x24VDC M12-L 8xM12 the LED ER/MS flashes red. You can read out the diagnostics
alarms in the diagnostics buffer of the CPU, for example. You can evaluate the error codes
with the user program.
Table 5- 4 Diagnostics alarms, their meanings and corrective measures
Diagnostics alarm Error code
Wire break 6
H
Parameter error 10
Hardware interrupt 16
lost
Short-circuit to 106
ground
I/O device digital inputs DI 16x24VDC M12-L 8xM12 (6ES7141-6BH00-0BB0)
Equipment Manual, 06/2021, A5E46570510-AB
Meaning
Fault in the external circuitry
Encoder faulty
Load resistance too high
Impedance of encoder circuitry is too high Use a different encoder type or modify
Interruption of cable between the I/O
device and sensor.
Channel not connected (open)
• I/O device cannot evaluate parameters
H
for the channel
• Incorrect parameter assignment
The I/O device cannot trigger an interrupt
H
because the previous interrupt was not
acknowledged; possible configuration
error
Short-circuit to ground
H
Interrupts/diagnostics alarms
Corrective measures
Check the external circuitry and correct
the fault.
Replace the encoder.
Reduce the load resistance.
the wiring. For example, use cables with a
larger cross-section.
Establish the connection.
• Disable diagnostics
• Connect a resistor of 25 kΩ to 45 kΩ
to the encoder contacts.
Correct the parameter assignment.
• Change the interrupt handling on the
CPU. Reassign the parameters to the
I/O device, if necessary.
• The error persists until the I/O device is
assigned new parameters.
• Correct the process wiring.
• Replace the defective encoder.
5.3 Alarms
27