Omron CS1D DUPLEX SYSTEM - 10-2009 Operation Manual page 483

Online Replacement of I/O Units, Special I/O Units, and CPU Bus Units
Name and model
number
Hardware
settings on
CPU Bus Unit
DeviceNet Unit Unit number
(rotary switch)
CS1W-DRM21-V1
Node address
(rotary switch)
Baud rate
(rotary switch)
Continuation
of remote I/O
for communi-
cations error
(master, DIP
switch)
Hold/Clear of
remote I/O for
communica-
tions error
(slave, DIP
switch)
Loop Control Unit Unit number
(rotary switch)
CS1W-LC001
Settings
Settings stored Settings stored
in CPU Unit in CPU Bus
Unit
In CPU Bus In non-volatile
Setup Area: memory:
• Routing tables • Scan list (mas-
(when required) ter)
• Communica-
tions cycle time
settings (master)
• Slave scan list
(slave)
• Message moni-
tor time list (for
message com-
munications)
• Master/Slave
function enable
settings
In allocated DM In battery-
Area words: backup RAM or
None flash memory (if
save is per-
formed for flash
memory):
• Function block
data
Precautions
Refer to the DeviceNet Unit operation manual for replace-
ment procedures, and observe the following precautions.
When Using Master Function
1) All parameters are stored in non-volatile memory in the
Unit. Write all of these parameters to the Unit before
starting the replacement procedure by downloading them
from the DeviceNet Configurator. (See note 2.)
2) Remote I/O communications will stop when the
DeviceNet communications connector is removed and
communications errors will occur at all the slaves.
3) At this point, a network power error can be confirmed at
the CPU Unit. The status of all inputs to the CPU Unit
from the DeviceNet Unit will be held by the CPU Unit.
4) The outputs from Output Slaves will be either held or
cleared when the communications error occurs, depend-
ing on the settings at the slaves.
5) Remote I/O communications will automatically recover
when the DeviceNet communications connector is recon-
nected after the replacement operation. After recovery,
the status of outputs from Output Slaves will be con-
trolled again by the status of the output words allocated
to them in the CPU Unit.
When Using Slave Function
1) Just like the master function, all parameters are stored in
non-volatile memory in the Unit. Write all of these param-
eters to the Unit before starting the replacement proce-
dure by downloading them from the DeviceNet
Configurator. (See note 2.)
2) A communications error will occur at the master when the
DeviceNet communications connector is removed.
Depending on the settings of the master, all I/O commu-
nications may stop. Check the settings and operation of
the master.
3) A network power error can be confirmed at the CPU Unit.
The status of all inputs to the slave (outputs from the
CPU Unit will be held or cleared according to the setting
on the DIP switch.
4) If the master is set so that remote I/O communications
will not stop, only communications for the Unit being
replaced will stop and normal communications will be
possible for other slaves. Normal communications will
recover when the DeviceNet communications connector
is reconnected.
5) If the master is set so that all remote I/O communications
stop, then restarting communications must be specified
at the master after the Unit is replaced and the communi-
cations connector is reconnected.
6) Set the same unit number on the new Unit as was set on
the Unit being replaced.
Note The version 1 (-V1) DeviceNet Unit (to be released
soon) will support a simple backup function. If the
data stored in the non-volatile memory in the Unit is
saved to a Memory Card in advance and the Memory
Card is inserted into the CPU Unit, the Memory Card
can be used after online replacement to automatically
transfer the required data to the new Unit. (See note
1.) The remaining precautions given above will still
apply.
Refer to the Loop Control Unit operation manual for replace-
ment procedures, and observe the following precautions.
1) Turn OFF the power supply to all external devices con-
nected to the Unit before starting the replacement proce-
dure.
2) Set the same unit number on the new Unit as was set on
the Unit being replaced.
3) Write the same function block data as the previous Unit
to the new Unit and save it to flash memory in advance
by downloading them from the CX-Process Tool. (See
note 2.)
Section 11-4
447