Broken Wire Signal - Siemens S5-135U/155U System Manual

Analog Input/Output Modules
9.3.12

Broken Wire Signal

Broken Wire
An open-circuit in the lines to a resistance thermometer is indicated as
Signal in the follows:
Standard Pt 100
Range
Broken Wire at
1)
If the mode "without broken wire signal" is selected on the module, an
open-circuit of the resistance thermometer is indicated with an overflow.
Unassigned channels can be used for voltage or current measurement.
Broken Wire
If a line of the auxiliary circuit (I
Signal in the
limit" is encoded for all inputs and the overflow bit is set to "1." In the event
Extended Pt 100 of a sensor or measuring line open-circuit, the error bit is additionally set to
Range "1" for the relevant channel.
9-22
Module Reaction, Encoded Value
M+
M–
Pt 100
I
C+
I
C–
With the 460 analog input module, the value 0 is also encoded for the intact Pt 100 resistances
because the auxiliary circuit is interrupted; the error bit will not be set for these channels.
Error Bit E
0
0
1)
0
0
0
, I ) is interrupted, the "negative range
C+ C-
C79000-G8576-C199-06
1
1
1
0
0
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