Wiring Front Connectors; Assigning Front Connectors To Modules - Siemens SIMATIC S7-300 Hardware And Installation Manual

Wiring
6.5

Wiring front connectors

Introduction
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.
Front connector versions
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 6-5
Module
Signal modules
(not 32-channel),
Function modules,
Communication module
CP 342-2
CPU 312 IFM
Signal modules
(32-channel)
CPUs 314 IFM and 31xC
Termination with spring terminals
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.
Tip:
There is a separate opening for test probes up to 2 mm in diameter to the left of the
opening for the screwdriver.
Prerequisite
The modules (SM, FM, CP 342-2) are mounted on the profile rail.
6-8

Assigning front connectors to modules

Front connectors with
screw terminals; Order
6ES7 392-1AJ00-0AA0
6ES7 392-1AM00-0AA0
S7-300 Programmable Controller Hardware and Installation
Front connectors with
spring terminals; Order
No.:
6ES7 392-1BJ00-0AA0
6ES7 392-1BM01-0AA0
No.:
A5E00105492-01