553BTechnical specifications
A.6 Analog signal modules (SMs)
S7-1200 Programmable controller
706
System Manual, 11/2011, A5E02486680-05
Table A- 86 Diagnostics
Model
SM 1234 AI 4 x 13 bit / AQ 2 x 14 bit
Overflow/underflow
Yes
1
Short to ground (voltage mode only)
Yes on outputs
Wire break (current mode only)
Yes on outputs
24 VDC low voltage
Yes
1
If a voltage greater than +30 VDC or less than -15 VDC is applied to the input, the resulting value will be unknown and
the corresponding overflow or underflow may not be active.
Table A- 87 Wiring diagrams for the analog input/output SM
SM 1234 AI 4 x 13 Bit / AQ 2 x 14 bit (6ES7 234-4HE30-0XB0)
Note
Unused analog inputs should be shorted.
When the inputs are configured for "current" mode, no current will flow through the input
unless you supply external power to the module.