Table of Contents
Number
Possible Causes
of Red
Strobes
6
One of the following
remote I/O
conditions exist:
Communications
between the
CPU and a
Scanner 2 is
failing.
Scanner 2 is
unable to
communicate to
a module or a
wrong module is
installed.
A module in the
I/O rack is
reporting a
diagnostic.
C75 and
Scanner 2
firmware
versions are
incompatible.
Scanner 2, I/O
rack, or power-
supply is
defective.
C75 module is
defective
A bad channel
has been
detected on one
of the modules.
Revision 10
ControlEdge HC900 Process & Safety Controller User and Installation Manual
May 2019
Lead and/or Reserve
Controller Action(s)
Associated blocks set their fail
1.
pins on, their warn pins off,
and their output pins to the
failsafe value.
Associated blocks set their IO
2.
statuses to either "Channel
No Comm" if the module
cannot be communicated to or
a message indicating the bad
channel condition.
Associated rack monitor
3.
block's module fail pin is
turned on.
Associated rack monitor
4.
block's RACK OK pin is turned
off.
ASYS and FSYS blocks' HW
5.
OK pins are turned off.
User Action
Locate the Scanner 2 that has a
status LED indicating a
diagnostic, and follow the
scanner 2 diagnostic section to
solve the problem.
Honeywell OI
HCDesigner/HC
Indication
Utilities
Indication
See "Rack
See the
Diagnostics"
associated
rack's "Rack
dialog box.
Diagnostics
Overview"
display for
details
regarding the
diagnostic.
193
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