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C200H I/O Link Units Section 6-1
Control Words (C: First Control Word)
Using the IOWR
Instruction to Read Data
(C200HX/HE PLCs)
n the example, the IOWR instruction is used to read words IR 010 to IR 029
(20 words) on the Slave Unit, and store them in the Master (C200HX/HG/HE
PLCs) from DM 2000 onwards. For more detailed information on explicit mes-
sages, refer to the DeviceNet Master Unit Operation Manual. For information
on the IOWR instruction, refer to the SYSMAC C200HX/HG/HE PLCs Opera-
tion Manual.
Example Conditions
Master node address: 63
Master’s Unit address: 0
Slave node address: 2
Example: Using the IOWR Instruction
C: Control Words (C: First Control Word)
Source Words (S: First Source Word)
D+2 00 02 No. of received bytes (data length after D+3):
2 bytes
D+3 02 9E Slave node address: 2
BYTE DATA WRITE response service code:
9E Hex
Word Contents (Hex) Meaning
C 00 32 No. of bytes of command data: 50 bytes of
command data, S
C+1 00 08 No. of bytes of response data: 8 bytes of
response data, D
C+2 00 01 Destination node network address: 1
C+3 3F FE Master’s node address: 63
Master’s Unit address: FE Hex
C+4 00 00 Response returned, communications port
No.: 0, No. of retries: 0
C+5 00 64 Response monitoring time: 10 s
Word Contents (Hex) Meaning
Word Contents (Hex) Meaning
C 3F FE Master’s node address: 63
Master’s Unit address: FE Hex
Word Contents (Hex) Meaning
S 82 07 Response storage words: DM2000
82 Hex: DM Area, 0700 Hex: 2000 words
(For more detail, refer to the PLC Operation
Manual.)
S+1 D0 00
S+2 00 64 Response monitoring time: 10 s
S+3 00 0B No. of bytes of command data: 11 bytes (No.
of bytes from S+4 onwards.)
S+4 28 01 EXPLICIT MESSAGE SEND command
code: 28 01 Hex
S+5 02 1C Slave node address: 2
BYTE DATA READ response service code:
1C Hex
S+6 00 2F Class ID: 002F Hex
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