Communication modules
6.2 CP51M1 communication module
SIMATIC TDC hardware
System Manual, 08/2017, A5E01114865-AL
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Control and display elements
LED displays
LEDs H1, H2, H7 and H8 indicate the operating state of communication module CP51M1.
LEDs H3 to H6 provide information about the current network traffic.
Figure 6-3 Front panel of CP51M1