Rockwell Automation 1755-OF8 GuardPLC Controller Systems - Manual (Page 148)

148 Publication 1753-UM001C-EN-P - March 2010
Chapter 15 Diagnostics
I/O Status
While the system is in Run mode, ERR is indicated continuously for
both a module and a channel error. Depending on the type of error,
the module switches off only a faulty output channel, but the
operation of the other outputs continues, or all the output channels
are switched off. The inputs are always in operation. A faulty input
channel transmits Low-signal to the logic. If the entire module is
switched off, all input and output channels are switched off.
1755-IF8 Analog Input
Module Status Indicators The 1755-IF8 analog input module (AB-AI) has status indicators for:
•
power supply.
•
module status.
While the system is in Run mode, ERR is indicated continuously for
both a module and a input channel error. Depending on the type of
error, the module may switch off only one input channel (that is, a
faulty channel transmits the value 0 to the logic, but the module
continues operation with the remaining channels). If the entire
module is switched off, all input channels transmit the value 0 to the
logic.
Status Explanation
On (yellow)
•
Input is high
•
Output is energized
Off
•
Input is low
•
Output is de-energized
RUN ERR
1755-
IF8
Indicator Status Description
RUN ON (green) The module has the correct operating voltage (24V DC).
OFF The module has no power.
ERR ON (red) If the system is in Stop mode, one or more of the inputs or
outputs is faulty, or the module is faulty.
Use the RSLogix Guard PLUS! software to verify the location
of the fault. If the module is faulty, replace the module
immediately, or the safety-related operation of the
GuardPLC 2000 controller is not maintained.
OFF The module is operational.