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S7-300 Automation System, Hardware and Installation: CPU 31xC and CPU 31x
7-8 A5E00105492-03
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The PS 307 power supply module is equipped with two additional DC 24 V
connections (L+ and M) for the supply of I/O modules.
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The front connector is used to connect the sensors and actuators of your system to
the S7-300 PLC. Wire the sensors and actuators to this front connector and then
plug it into the module.
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Front connectors come in 20-pin and 40-pin versions, each with screw contacts or
spring terminals. 40-pin front connectors are required for CPUs 31xC and
32-channel signal modules.
You must use the following front connectors, depending on the module:
Table 7-4 Assignment of front connectors to modules
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Signal modules
(not 32-channel),
Function modules,
Communication module
CP 342-2
6ES7 392-1AJ00-0AA0 6ES7 392-1BJ00-0AA0
Signal modules
(32-channel) and
CPU 31xC
6ES7 392-1AM00-0AA0 6ES7 392-1BM01-0AA0
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To terminate a conductor in a front connector with spring terminals, simply insert
the screwdriver vertically into the opening with the red opening mechanism, insert
the wire into the terminal and remove the screwdriver.
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