8 - 2 WBPEEUI240751C0
Power LEDs
Power LEDs
Table 8-2 summarizes the block power and field power LED
indications and gives corrective actions.
Status Code LEDs
The eight status indicators on the front of the I/O module
show both normal and error status codes. The status codes
appear in binary format. LED eight is the most significant bit.
Refer to Table 8-3 to decipher status codes and determine pos-
sible corrective actions if necessary.
Table 8-1. Operating Mode - Normal and Fault LEDs
Indicator State Description Corrective Action
Normal On Operational and online. No action required.
Flashing Established communication but not
initialized or configured.
Normal indication until the controller
downloads and verifies the I/O block
configuration. If the problem persists,
check the controller.
Configured and operational but lost
communications with the controller .
1. Check the controller status.
2. Reset the I/O module.
Off No power. If this condition exists, no
front panel LEDs will be on.
Refer to Table 8-2 for power problem
corrective actions.
Communication not established with
controller for the first time.
Normal condition while waiting for
controller to establish communica-
tion. Check the controller status.
Fault condition exists (with F AUL T
indicator on).
Refer to FAULT LED description.
Fault On CPU halted (with status code given
in eight status LEDs).
Refer to Table 8-3 in this section for
status code descriptions and correc-
tive actions.
Machine fault timer expired. Refer to
Machine Fault Timer
in Section 3
for a description.
Reset the I/O module. If problem per-
sists, replace the I/O module.
Stop/reset button activated. Normal indication after manual hard-
ware stop and during a reset.
Off No fault condition. No action required.
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