Siemens S7-300 - Assignment of Front Connectors to Modules

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S7-300 Automation System, Hardware and Installation: CPU 312IFM - 318-2 DP
7-8 A5E00203919-01
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The front connector is used to connect the sensors and actuators of your system to
the S7-300 automation system. 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. The 40-pin front connector is required for 32-channel signal
modules.
You must use the following front connectors, depending on the module:
Table 7-6 Assignment of front connectors to modules
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Signal modules
(not 32-channel),
Function modules,
Communication module
CP 342-2
CPU 312 IFM
6ES7 392-1AJ00-0AA0 6ES7 392-1BJ00-0AA0
Signal modules
(32 channel) and CPUs
314 IFM
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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You can damage the spring-based openin
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mechanism of the front connector if the
screwdriver slips sideways or if you insert the wrong size of screwdriver. Always
slide a suitable screwdriver vertically into the desired opening until it reaches the
stop. This will ensure that the spring terminal is fully open.
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