SIMATIC TOP Connect and SIMATIC TOP Connect TPA
8-16
Programmable Logic Controllers S7-300 Module Data
A5E00105505-03
8.3.3 Wiring the Module with Terminal Block for Three-Conductor
Connection
Connection Notes
Table 8-9 Connection Notes for SIMATIC TOP connect with Three-Conductor Connection
Digital Modules
Connection Notes
Supply Voltage Feed-In Additiona
Descrip-
At front
connec-
tor only
Add.
ground
conn. at
terminal
block
At front
connector
or terminal
block
required a
power
supply
terminal
block not
in line with
descrip-
tion on SM
SM 321; DI 32 x DC 24 V – –   –
SM 321; DI 16 x DC 24 V – –   –
SM 321; DI 16 x 4 VDC; source input – –   –
SM 322; DO 32 x DC 24 V/0.5 A – –  – –
SM 322; DO 16 x DC 24 V/0.5 A – –  – –
SM 322; DO 8 x 24 VDC/0.5 A with
diagnostic interrupt
– –   
SM 323; DI 16/DO 16 x 24 VDC/0.5 A – –  – –
SM 323; DI 8/DO 8 x 24 VDC/0.5 A – –  – –
Assignment of the terminal block for three-conductor connection
Table 8-10 Terminal Assignments of the Terminal Block for Three-Conductor Connection
Front view of terminal block
Assignments of the Terminals
Top row:
Terminals 0to 7:inputs/outputs x.0 to x.7
Center row:
All terminals: M potential
Bottom row:
All terminals: L + potential
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