Siemens ET 200pro Operating Instructions Manual page 403

M12 compensation connector for thermocouples
M12 compensation connectors are designed for "RTD (0)" temperature compensation
(provided the "Reference junction" parameter is set to "RTD (0)"). M12 compensation
connectors are not required for any other type of temperature compensation.
M12 compensation connector contains an integrated Pt1000 resistance thermometer (where
α = 0.003851) to compensate for the reference junction temperature for thermocouples. The
α value conforms to the EN 60751, GOST 6651, JIS C 1604, and ASTM E-1137 standards.
M12 compensation connectors need to be assembled after delivery. You can connect
thermocouples via terminals 2 and 4 of M12 compensation connectors.
The M12 compensation connector on the CM IO 4 x M12 connection module is screwed to
circular socket connector X1 (torque: 1.5 Nm). The procedure is the same as for M12
connectors (see the section titled Installing the connection module).
Note
M12 compensation connector is only designed to be used with the 4 AI TC High Feature
electronic module. In order to comply with degree of protection IP67, operation without
cables is not permitted.
The table below shows the pin assignment for M12 compensation connectors:
View of an M12 compensation connector
①
②
③
ET 200pro distributed I/O system
Operating Instructions, 03/2013, A5E00335544-08
15.4 4 AI TC High Feature analog electronic module (6ES7144-4PF00-0AB0)
Wire of cable made from thermocouple materials
Integrated Pt1000 resistance thermometer
M12 compensation connector
Terminal Assignment X1
1 Measuring line positive M+
assigned with internal Pt1000
2 Input signal M
3 Measuring line negative M-
assigned with internal Pt1000
4 Input signal M
5 Functional earth (FE)
Analog electronic modules
+: Connector X1
0
-: Connector X1
0
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