8
TROUBLESHOOTING
8.1 Troubleshooting Flow
8.1.11 When "UNIT LAY. DIFF." Occurs
8
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1
OV
ER
VIE
W
2
SYS
TEM
CONFIGURA
TI
ON
3
TR
AC
KI
N
G
C
ABL
E
4
P
R
OCE
DURE
FO
R
S
TAR
TING
UP
A
RE
DUN
DAN
T
S
Y
S
T
E
M
5
RE
DUNDA
NT S
Y
S
T
E
M
FUNCTIONS
6
RE
DUN
DAN
T
S
Y
S
T
E
M
NE
TW
O
R
K
S
7
PR
OG
R
A
MM
IN
G
CA
UTIO
N
S
8
TR
O
U
BLE
S
HOOTING
8.1.11 When "UNIT LAY. DIFF." Occurs
The following shows the flowchart for when "UNIT LAY. DIFF." occurs during operation of
the redundant system.
Diagram 8.12 Flowchart for when "UNIT LAY. DIFF." Occurs
NO
NO
NO
NO
YES
YES
NO
YES
YES
YES
Error message [UNIT LAY. DIFF. ]
was detected.
Is error code [6030]?
Are module mounting
constitutions of control system and
standby system of redundant
system the same?
Module mounting status of control system
and standby system should be the same.
Are mode settings of systems
A and B of network module the same?
Set the mode setting of system B the
same as mode setting of system A in
Redundant settings of network parameter.
Is error code [6035]?
Since the CPU model name differs
between control system and standby
system in redundant system, use the
same one.
Is error code [6036]?
Check to see if network cable is not
broken, since remote I/O constitution of
MELSECNET/H multiplexed remote I/O
network differs between control system and
standby system in the redundant system.
Hardware failure of the following modules is
suspected.
1
CPU module
2
Main base unit or extension base unit
3
Extension cable
Operate the systems sequentially from the minimum
system which is the main base unit where the power
supply module and the CPU module are mounted.
For a module which does not operate, consult your
local Mitsubishi representative, explaining a detailed
description of the problem.
