LED
Colour State
Meaning
Common rail
system
off
Module without voltage or no communication
Yellow illuminates continuously Module connected to bus, communication is
running
Red
illuminates continuously Error
DS
off
Module without voltage/deactivated
Green illuminates continuously Module in operation
Red
illuminates continuously Error
flashes 1:1 (on:off)
Configuration fault
flashes 2:1 (on:off)
Module in operation, internal diagnosis availa‐
ble
Tab. 91 Modbus communications module – Interpretation of LEDs
9.9.3 Displays at the Modbus TCP module
The communication module features LEDs providing information about the module status.
Fig. 38 Modbus TCP communication module – LEDs and interface
1
Communications module
2
LED NS: Network status
3
LED MS: Module status
4
Modbus TCP Port 1
5
Modbus TCP Port 2
6
LED connection status Port 1
7
LED connection status Port 2
LED
Colour State
Meaning
2
NS
off
Module without voltage or IP address not available
Green illuminates continuously
Module in operation, active or idle
flashes
Module waits for connection
Red
illuminates continuously
Duplicate IP address or internal fault
flashes
Monitoring time exceeded (time-out)
3
MS
off
Module without voltage
Green illuminates continuously
Module in operation
Red
illuminates continuously
Internal fault, module in "EXCEPTION" status
flashes
Fault in diagnostic object or IP address conflict
9
Operation
9.9
Communication modules
150
Service Manual Controller
SIGMA CONTROL 2 BLOWER ≥ 4.0.X
No.: 901700 14 E
