Siemens SIMATIC ET 200AL System Manual page 264

Wiring
3.1 Terminal and block diagram
The image below shows the terminal and block diagram of the IM 157-1 DP interface module.
① Electronics
② ET-Connection interface
③ Internal supply voltage
④ Rotary coding switch for PROFIBUS addresses
X1 DP1 1. PROFIBUS interface
X1 DP2 2. PROFIBUS 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)
DP PROFIBUS LED (green)
ET-CON1, ET-CON2 ET-Connection LEDs (green)
Equipment Manual, 08/2021, A5E32100641-AE
3
IM 157-1 DP (6ES7157-1AA00-0AB0)