Siemens Simatic S7-1500 Manual page 124

Interrupts/diagnostics alarms
6.2 Interrupts and diagnostics
Structure of the additional interrupt information
Table 6- 9 Structure of USI = W#16#0001
Data block name
USI
(User Structure Identifier)
The channel that triggered the hardware interrupt follows.
Channel
It is followed by the event that triggered the hardware interrupt.
Event
Diagnostics alarms
A diagnostics alarm is output for each diagnostics event and the ERROR LED flashes on the
analog on-board I/O. The diagnostics alarms can, for example, be read out in the diagnostics
buffer of the CPU. You can evaluate the error codes with the user program.
Table 6- 10 Diagnostics alarms, their meaning and corrective measures
Diagnostics alarm
Wire break
Overflow
Underflow
Short-circuit to ground
124
Contents
W#16#0001
B#16#00 to B#16#n
B#16#03
B#16#04
B#16#05
B#16#06
Error code Meaning
6 Resistance of encoder circuit too
H
high
Interruption of the cable between the
analog on-board I/O and sensor
Channel not connected (open)
7 Measuring range exceeded
H
The output value set by the user
program exceeds the valid rated
range/overrange
8 Value below measuring range
H
The output value set by the user
program is below the valid rated
range/underrange
1 Overload at output
H
Short-circuit of output Q
Comment
Additional hardware interrupt information of the
analog on-board I/O
Number of the event-triggering channel (n =
number of analog on-board I/O channels -1)
Below low limit 1
Above high limit 1
Below low limit 2
Above high limit 2
Remedy
Use a different encoder type or modify the
wiring, for example, using cables with
larger cross-section
Connect the cable
Disable diagnostics
•
Connect the channel
•
Check the measuring range
Correct the output value
Check the measuring range
Correct the output value
Eliminate overload
to M Eliminate the short-circuit
V ANA
CPU 1512C-1 PN (6ES7512-1CK00-0AB0)
Bytes
2
1
1
Manual, 09/2016, A5E35306440-AB