Testing Communication Via The Profibus-Dp - Siemens OP7 Equipment Manual

15.6

Testing Communication via the PROFIBUS-DP

Bus fault LED Mounted on the rear side of unit variants DP and DP-12 is a bus fault LED
(figure 15-2). When the OP is connected to SIMATIC S7, this LED indicates
that communication between the OP and the PLC over PROFIBUS-DP is OK
by lighting up constantly. If the LED is constantly OFF, communication is
disturbed.
The LED can be used for rapid diagnosis of any problems that might occur
during communication.
Figure 15-2 Location of the Bus Fault LED at the Rear of the OP
15-8
Equipment Manual OP7, OP17
Release 04/99