Leds On The 1Si 3964/Ascii, 1Si Modbus/Uss - Siemens SIMATIC ET 200S Manual

Commissioning and Diagnostics
Serial interface module 1SI 3964/ASCII, 1SI Modbus/USS
SF
Group
error (red)
TX RX
Status indicator
Figure 6-16

LEDs on the 1SI 3964/ASCII, 1SI Modbus/USS

6-20
LEDs Meaning
SF TX RX
on Hardware fault
Firmware error
Parameter assignment
error
Wire break or loose cable
between the module and
the communication
1)
partner
Communication error
on The module is sending
data via the interface.
on The module is receiving
data via the interface.
1)
Only detected in the case of RS422 interface connections when the
default for the receive line is set to R(A) 5V/R(B) 0V
Remedy
Check the module.
Check the parameter
assignment. Evaluate the
diagnostic information.
Check the wiring.
Check the communication
settings.
ET 200S Distributed I/O System
EWA-4NEB 780602402-12