Siemens SIMATIC ET 200AL System Manual page 318

Wiring
3.1 Terminal and block diagram
The image below shows the terminal and block diagram of the IM 157-1 PN interface module.
① Switch
② Electronics
③ ET-Connection interface
④ Internal supply voltage
X1 P1 R 1. PROFINET interface
X1 P2 R 2. PROFINET interface
X80 Infeed of supply voltages
X81 Loop-through of supply voltages
X30 Infeed of the ET-Connection
X31 Loop-through of the ET-Connection
Figure 3-1 Terminal and block diagram
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1L+ Supply voltage 1L+ (non-switched)
1M Ground 1M (non-switched)
2L+ Load voltage 2L+ (switched)
2M Ground 2M (switched)
RUN LED operating state (green)
ERROR LED diagnostics status (red)
MAINT LED diagnostics status (yellow)
P1 LINK, P2 LINK PROFINET LEDs (green)
ET-CON1, ET-CON2 ET-Connection LEDs (green)
Equipment Manual, 05/2021, A5E32347036-AE
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IM 157-1 PN (6ES7157-1AB00-0AB0)