Siemens 181

Parameter data record
A.3 Switchable wire break check
Analog input module AI 4xRTD/TC 2-/3-/4-wire HF (6ES7134-6JD00-0CA1)
Manual, 02/2014, A5E03573289-AD
61
A.3
Switchable wire break check
Function
The "Switchable wire break check" is available for thermocouples. It switches off the wire
break check for the module.
This is required, for example, to calibrate thermocouples, since the test current necessary for
a wire break check leads to measurement errors during calibration.
The function has no effect on channels that are not assigned in the thermocouple mode.
Note
Startup and parameter reassignment
The wire break check is switched on again at each startup and during any parameter
reassignment of the module.
Switch-off via the user program
You can deactivate the wire break check using data record 237.
Table A- 12 Structure of data record 237, switchable wire break check
Byte
Function
Format
Value
Description
0
Command
UBYTE
80
H
Wire break check
1
Identifier
UBYTE
00
H
Not relevant
2
Channel number
UBYTE
FF
H
All channels
3
Calibration step
UBYTE
FF
H
First triggering
4
Measurement type
UBYTE
00
H
Not relevant
5
Measuring range
UBYTE
00
H
Not relevant
6 Action UBYTE
01
H
Deactivate wire break check
02
H
Activate wire break check
7...17
Reserved
UBYTE
00
H
Not relevant