Status Indicators; Module Status Indicators; I/O Status Indicators - Siemens SIMATIC TI505 User Manual

4.1

Status Indicators

Module Status
Indicators
I/O Status
Indicators
4-2 Troubleshooting
The MOD GOOD indicator turns on when the module is receiving the
correct power.
The COM OK indicator has three modes of operation. When the LED is not
on, this indicates that the communication cable is not installed properly or
that the controller is not functioning properly. When the LED is blinking, it
indicates that the module is not configured properly in the controller. When
the LED remains on, this indicates that communication is occurring and
that the unit is configured properly.
The FUSE indicator turns on when the fuse is blown. You also can
determine the status of the fuses by using RLL to check the module fail bit
in the controller. (See your SIMATIC TI505 Programmable Controller
manual.)
There are six output status LEDs. The output status indicators show the
status of the output points. When an output point is on, the corresponding
LED lights. The output indicators show the status from the logic (controller)
side, not the field side.
There are ten input status LEDs. The input status indicators show the
status of the input points. When an input point is on, the corresponding
LED lights. The input indicators show status from the field side, not the
logic (controller) side.