Checking Operations Of Cqm1 Master Units; Indicators - Omron C200HW-SRM21-V1 - 08-2007 Operation Manual

Checking Operations of CQM1 Master Units

6-4

Checking Operations of CQM1 Master Units

6-4-1

Indicators

Error Status
Situation
RUN ERC
Normal com- ON OFF OFF
munications
PLC's power OFF OFF OFF
OFF
I/O UNIT OVER OFF OFF OFF
error
I/O BUS error ON/ OFF OFF
OFF
Slave not con- ON OFF OFF
nected
Data area over- ON ---
lap
Address over ON ---
error
Communica- ON ON
tions error with
a Slave
Communications Error
Node Number Indicators
1,2,3...
The Master Unit's indicators can indicate operating errors.
Indicator status
ERS SD RD
ON ON
OFF OFF OFF
OFF OFF OFF
OFF OFF OFF
ON OFF OFF
ON OFF OFF ON
Flashing ON ON
--- ON ---
Note Check the system's operation with just one Slave connected (one Slave at a
time) if the CompoBus system doesn't operate but the Master's indicator sta-
tus doesn't match any of those in the following table.
When a communications error occurs with a Slave during communications
and the ERC indicator lights or the ERS indicator lights or flashes, the other
indicators will show the node number of the Slave where the error occurred in
binary.
When several communications errors occur simultaneously, the node number
with the highest priority error will be displayed. The priority is as follows:
1. Area overlap error (ERS lit)
2. Address over error (ERS flashing)
3. Communications error (ERC lit)
ALM Probable cause
Output
OFF ---
The PLC's power is OFF.
The PLC's limit on I/O
points was exceeded by the
CompoBus/S Master Unit.
The connection between
the CPU Unit and I/O bus is
not correct.
No Slaves are connected,
or the communications
mode of each Slave does
not match that of the Master
Unit.
When the "number of
points/node number" set-
ting is set to 4, this status
indicates that the same
area is allocated to more
than one Slave. Communi-
cations will be stopped.
OFF When the "PLC word allo-
cation" setting is 2 or 4
words, this status indicates
that an out-of-range node
number from 0 to 7 has
been set.
ON An error has occurred with
a Slave during communica-
tions and it is withdrawn
from the system.
Section 6-4
Possible remedy
---
Turn the PLC's power sup-
ply ON.
Reduce the PLC word allo-
cation setting or remove
one of the other Units.
Check the mounting of each
I/O Unit and the End Cover.
Turn the PLC ON again
after correcting the cause of
the error.
Use a Slave that can com-
municate properly, or make
the communications mode
of each Slave match that of
the Master Unit.
Check the area allocated to
the 8-point Slave where the
error occurred, eliminate
the area overlap, and then
restart the PLC.
See Communications Error
Node Number Indicators
below.
Check the indicators and
set the node number to an
acceptable value.
See Communications Error
Node Number Indicators
below.
Check the indicators and
clear the cause of the com-
munications error. See
Communications Error
Node Number Indicators
below.
377