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Overview Section 6-1
Note A specific FINS command (command 2801) is used to send explicit mes-
sages.
Note A specific FINS command (command 2801) is used to send explicit
messages.
Note This CS/CJ-series DeviceNet Unit (CS1W-DRM21 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.
6-1-4 Message Communications Specifications
Item Sending Receiving
Network commu-
nications instruc-
tion
CMND(490) using FINS command code 2801 Hex
can be used to send explicit messages to
DeviceNet devices. (See note.)
Automatically responds to explicit messages
from other devices.
Remote devices
and supported
functions
Masters/slaves made by other manufacturers. Sup-
ported services determine supported functions.
PCs with CS/CJ-series DeviceNet Units mounted.
Remote CPU Unit status read/write and I/O memory
read/write functions supported.
PCs with C200H I/O Link Units mounted. Remote
CPU Unit I/O memory read/write function sup-
ported.
Masters made by other manufacturers.
PCs with CS/CJ-series DeviceNet Units.
PCs with C200H-series DeviceNet Master Units.
PCs 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.
Item Specification
Applicable PC CS/CJ-series
Unit model number CS1W-DRM21/CJ1W-DRM21
Max. No. of communica-
tions nodes per Unit
FINS mes-
sages
62 (node address 0 cannot be used for FINS communications)
Explicit mes-
sages
63
Communications instruc-
tions
Sending/
receiving
data
SEND and RECV instructions
FINS com-
mands
CMND(490) instruction
There are FINS commands addressed to the PC and others addressed to
the CS/CJ-series DeviceNet Unit.
Note: FINS commands can be sent to PCs with CS/CJ-series DeviceNet
Units mounted to them. FINS commands cannot be sent to PCs with
C200HW-DRM21-V1 or CVM1-DRM21-V1 DeviceNet Master Units
mounted to them.
Explicit
DeviceNet
messages
CMND(490) instruction
Sends explicit messages to masters/slaves made by other manufacturers,
PCs with C200H I/O Link Units, or PCs with CS/CJ-series DeviceNet Units
mounted to them.
Sources:destinations 1:1 (Broadcasting is not supported)
Data length (excluding command code) SEND: 267 words max.
RECV: 269 words max.
CMND 542 bytes max.
No. of simultaneous instructions One each for 8 ports (ports 0 to 7)
Refer to the section on CMND(490) in the CS/CJ Series Programmable
Controllers Instructions Reference Manual (W340) for information on ports
(logical ports).