Service and maintenance
5.1 LED status display on the RF120C
Communications module RF120C with application blocks for S7-1200 and S7-1500
48
Operating Instructions, 07/2013, C79000-G8976-C328-01
Table 5- 1
LEDs below the upper cover of the housing
LED / colors Name
Meaning
green
DC 24 V
Indicates that voltage is being applied via the external 24 V
power supply.
green
PRE
Indicates the presence of a transponder.
yellow
Rx
Indicates live communication with the reader.
flashing red
ERROR
A flashing pattern indicates the last error to occur. The
meaning of the flashing patterns is explained in the section
"Error messages (Page 52)".
Note
LED colors when the module starts up
When the module starts up, all its LEDs are lit for a short time. Multicolored LEDs display a
color mixture. At this point in time, the color of the LEDs is not clear.
Display of the operating and communication status
The LEDs indicate the operating and communications status of the module according to the
following scheme:
Table 5- 2
Display of the basic states of the module by the "DIAG" LED
DIAG
(red / green)
Meaning
Comment
Off
Power OFF
-
green
Module configured
Configuration was completed successfully and
no error occurred.
flashing green
•
Startup
•
Module not configured
•
Firmware update
-
flashing red
•
Defect
•
Error
•
Alarm message
Check the ERROR LED and the 24 VDC LED
for more detailed error diagnostics.
red
Module defective
Replace the module.