Siemens SIMATIC S5 IP 281 Equipment Manual page 91

R 11/92
5.2 Startup
After switching on the supply voltage and an inactive RESET of the S5, the module is readv for
operation and-the green '%U-N" LED goes on.
Indication
RUN LED
ERR LED
o
0
of the Counter Module
Meaning
Voltage supply missing (from S5)
RESET is active.
Module is operating correctly.
Parameterization error or wire break
Commissioning the Counter Modu/e
5 – 3