3. Instructions
976
CS/CJ/NSJ Series Instructions Reference Manual (W474)
Hint
• ECHWR(724) sends an explicit message with the Service Code 1E hex (Byte Data Write).
Example Programming
In this example, ECHWR(724) is used to write data from the I/O memory of the local CPU Unit to the
I/O memory of a CJ-series CPU Unit on the DeviceNet network.
When CIO 0.00 and A202.06 (the Communications Port
Enabled Flag for port 06) are ON, ECHWR(724) reads
D0 to D2 from the I/O memory of the local CPU Unit and
stores the data in D100 to D102 of the CJ-series CPU
Unit with node address 07 on the DeviceNet Network
0.00
S
D
C
@ECHWR
D0
D100
D200
Communications
Port Enabled Flag (Port 6)
A202.06
DeviceNet
CJ1W-DRM21 DeviceNet Unit
(CPU Bus Unit with unit number 2)
Node address 07
CS1W-DRM21 DeviceNet Unit
CPU Unit
ECHWR(724)
instruction
CPU
Unit
Explicit
message
Unit address 12 hex (because
the unit number is 2)
15 8 7 0
C: D200 0 0 0 7
C+1: D201 0 0 0 3
C+2: D202 0 6 1 2
C+3: D203 0 0 0 0
C+4: D204 0 0 0 0
Node address of remote CPU Unit to be written to = 07 hex (node 07)
Write data size (number of words) = 3 hex
Communications port = 6 hex (port 6),
and the DeviceNet Unit’s unit address = 12 hex
Response monitoring time = 0000 hex (2 s)
Explicit format type = 0000 hex (DeviceNet format)
D: D100
D+1: D101
D+2: D102
S: D0
S+1: D1
S+2: D2
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