SIMATIC TOP Connect and SIMATIC TOP Connect TPA
8-14
Programmable Logic Controllers S7-300 Module Data
A5E00105505-03
8.3.2 Wiring the Module with Terminal Block for One-Conductor
Connection
Connection Notes
Table 8-7 Connection Notes for SIMATIC TOP connect with One-Conductor Connection
Digital Modules
Connection Notes
Supply Voltage Feed-In Additiona
Descrip-
At front
connector
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 24 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 DC 24 V/0.5 A
 – – – –
SM 323; DI 8/DO 8 x 24 VDC/0.5 A  – – – –
Assignments of the terminal block for one-conductor connection
Table 8-8 Terminal Assignments of the Terminal Block for One-Conductor Connection
Front view of terminal block
Assignments of the Terminals
Top row:
Terminals 0 to 7: inputs/outputs x.0 to x.7
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