
Installing an S7-200 PLC
2-15
S7-200 Programmable Controller System Manual
C79000-G7076-C233-01
L1
N
PE
[a]
DO
DI
PS
S7-200
DC/DC/DC
DO
EM 222
DC
DI
EM 221
DC
[e]
[g]
[b]
[c]
[d]
[f]
L+ M
24 VDC
AC
DC
[h]
Floating [f] or Grounded [g]
M
Figure 2-11 DC System Installation
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