Siemens SIMATIC S7-300 Module data User Manual

Analog modules
6.6 Analog input module SM 331; AI 8 x 13 Bit;(6ES7331-1KF01-0AB0)
S7-300 Automation System Module data
6-42 Manual, 08/2006, A5E00105505-04
Resistance measurement with 2, 3 and 4-wire connection
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8
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,
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6
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0
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0
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8
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,
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6
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0
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0
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8
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,
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6
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0
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0
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8
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,
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6
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0

0
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&+
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8
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6
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6
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Figure 6-13 Block diagram and wiring diagram
① 2-wire connection. A bridge must be produced between M and S (without line resistance
compensation).
② 3-wire connection
③ 4-wire connection. The fourth line must not be wired (line remains unused)
④ 4-wire connection. The fourth line is routed to the terminal strip in the cabinet but is not wired.
⑤ Internal supply
⑥ + 5V from backplane bus
⑦ Logic and backplane bus interface
⑧ Electrical isolation
⑨ Multiplexer
⑩ Analog to Digital Converter (ADC)
⑪ Source of current
Note
It is not necessary to interconnect the M- terminals when measuring resistances and
resistance thermometers. A connection between the M- terminals can however increase the
interference resistance.

Siemens SIMATIC S7-300 Module data Specifications

General

Series	S7-300
Manufacturer	Siemens
Protection Class	IP20
System	SIMATIC S7-300
Digital Inputs	Varies by module
Digital Outputs	Varies by module
Analog Inputs	Varies by module
Analog Outputs	Varies by module
Central Processing Unit	Varies by CPU model
Supply Voltage	24V DC or 120/230V AC
CPU Type	Varies (e.g., CPU 312, CPU 315, etc.)
Memory	Varies by CPU model
Communication Interfaces	MPI, PROFIBUS
Programming Languages	LAD, FBD, STL, SCL, GRAPH
Operating Temperature	0°C to 60°C
Storage Temperature	-40°C to 70°C
Relative Humidity	10% to 95% (non-condensing)