Honeywell 900U02-0100 - Page 207

Revision 10 ControlEdge HC900 Process & Safety Controller User and Installation Manual 193
May 2019
Number
of Red
Strobes
Possible Causes
Lead and/or Reserve
Controller Action(s)
User Action
Honeywell OI
Indication
HCDesigner/HC
Utilities
Indication
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.
1. Associated blocks set their fail
pins on, their warn pins off,
and their output pins to the
failsafe value.
2. Associated blocks set their IO
statuses to either “Channel
No Comm” if the module
cannot be communicated to or
a message indicating the bad
channel condition.
3. Associated rack monitor
block’s module fail pin is
turned on.
4. Associated rack monitor
block’s RACK OK pin is turned
off.
5. ASYS and FSYS blocks’ HW
OK pins are turned off.
Locate the Scanner 2 that has a
status LED indicating a
diagnostic, and follow the
scanner 2 diagnostic section to
solve the problem.
See the
associated
rack’s “Rack
Diagnostics
Overview”
display for
details
regarding the
diagnostic.
See “Rack
Diagnostics”
dialog box.