Siemens SIMATIC User Manual

Parameter sets of signal modules
A.11 Parameters of analog input module SM 331; AI 6 x TC isolated
S7-300 Module data
Manual, 06/2017, A5E00105505-AJ
573
External reference junction
The table below lists the codes for the external reference junction, to be entered at the
corresponding byte of data record 1.
Selection of an external reference junction
Code
Local thermoresistor
2#0
Remote thermoresistor 2#1
Temperature coefficient
The table below lists the codes for the temperature coefficient, to be entered at the
corresponding byte of data record 1.
Temperature coefficient
Code
Pt 0.003850 Ω/Ω/°C (IPTS-68)
2#0000
Pt 0.003916 Ω/Ω/°C 2#0001
Pt 0.003902 Ω/Ω/°C
2#0010
Pt 0.003920 Ω/Ω/°C
2#0011
Pt 0.003850 Ω/Ω/°C (ITS-90)
2#0100
Pt 0.003910 Ω/Ω/°C (GOST)
2#0101
Note
When selecting a temper
ature coefficient by writing data record 1 via an SFC or a GSD file,
the same temperature coefficient must be specified for every channel which uses the
external reference junction. If you select different temperature coefficients, this will lead to a
para
meter fault.

Siemens SIMATIC Specifications

General

Product type designation	SIMATIC
CPU	Varies by model
Memory	Varies by model
Input/Output	Varies by model
Communication	Varies by model
Programming Language	STEP 7
Operating Temperature	0°C to 60°C (varies by model)
Protection Class	IP20
Category	Programmable Logic Controller (PLC)