Message Communications Specifications - Omron CS1W-DRM21 Operation Manual

Overview
Item
Network commu- CMND(490) using FINS command code 2801 Hex
nications instruc- can be used to send explicit messages to
tion DeviceNet devices. (See note.)
Remote devices Masters/slaves made by other manufacturers. Sup-
and supported ported services determine supported functions.
functions
PLCs with CS/CJ-series DeviceNet Units mounted.
Remote CPU Unit status read/write and I/O memory
read/write functions supported.
PLCs with C200H I/O Link Units mounted. Remote
CPU Unit I/O memory read/write function sup-
ported.
6-1-4

Message Communications Specifications

Item
Applicable PLC
Unit model number
Max. No. of communica-
tions nodes per Unit
Communications instruc-
tions
Sources: destinations
Data length (excluding command code)
142
Note A specific FINS command (command 2801) is used to send explicit mes-
sages.
Sending
Note A specific FINS command (command 2801) is used to send explicit
messages.
Note This CS/CJ-series DeviceNet Unit (CS1W-DRM21(-V1) or CJ1W-DRM21)
contains a PLC Object so that the I/O memory of the CPU Unit of the
DeviceNet Unit can be read/written from other devices. The C200HW-DRT21
I/O Link Unit also contains a PLC Object so that the I/O memory of the CPU
Unit of the I/O Link Unit can be read/written from other devices. The C200HW-
DRM21-V1 and CVM1-DRM21-V1 DeviceNet Master Units, however, do not
have PLC Objects, the I/O memory of the CPU Unit for these Units cannot be
read or written from other devices.
CS/CJ-series
CS1W-DRM21(-V1)/CJ1W-DRM21
FINS mes- 62 (node address 0 cannot be used for FINS communications)
sages
Explicit mes- 63
sages
Sending/ SEND and RECV instructions
receiving
data
FINS com- CMND(490) instruction
mands
There are FINS commands addressed to the PLC and others addressed
to the CS/CJ-series DeviceNet Unit.
Note FINS commands can be sent to PLCs with CS/CJ-series DeviceNet
Units mounted to them. FINS commands cannot be sent to PLCs
with C200HW-DRM21-V1 or CVM1-DRM21-V1 DeviceNet Master
Units mounted to them.
Explicit CMND(490) instruction
DeviceNet
Sends explicit messages to masters/slaves made by other manufacturers,
messages
PLCs with C200H I/O Link Units, or PLCs with CS/CJ-series DeviceNet
Units mounted to them.
1:1 (Broadcasting is not supported)
SEND: 267 words max.
RECV: 269 words max.
CMND 542 bytes max.
Receiving
Automatically responds to explicit messages
from other devices.
Masters made by other manufacturers.
PLCs with CS/CJ-series DeviceNet Units.
PLCs with C200H-series DeviceNet Master
Units.
PLCs with CVM1/CV-series DeviceNet Master
Units.
All listed devices support status read/write and I/
O memory read/write for the local CPU Unit.
Specification
Section 6-1