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Appendix E
Mitsubishi Computer Link Master
(A-compatible 1C Frame, Model 1)
The Mitsubishi Computer Link Master (A-compatible 1C frame, model 1) Protocol is used to send user-speci-
fied or specific (e.g., Device Memory Read/Write) Computer Link commands using the A-compatible 1C frame
model 1 control protocol from a CS/CJ-series PLC (CPU Unit) connected through RS-232C or RS-422A to a
Mitsubishi PLC (Sequencer CPU Module installed in a Computer Link Module). This protocol enables the
OMRON PLC to be used as the host (master) to remotely execute RUN/STOP for or read/write the device
memory of a Mitsubishi A/QnA/Q-series PLC that is connected either serially or on a MELSECNET/Ethernet
network.
Communications Specifications
Serial Communications Unit/Board
CPU Unit
PMCR(260)
Executing standard system Computer Link Master Protocol
Computer Link Unit
RS-232C or RS-422A (Computer Link)
Mitsubishi PLC
OMRON CS/CJ-series PLC
Computer Link
command
Item Specifications
Protocol Computer Link, A-compatible 1C frame, model 1
Transmission path connec-
tion
Multi-point
Host (OMRON CS/CJ-series PLC): Mitsubishi Sequencer CPU Module
1:1, 1:n (n = 32 max), m:n (m+n = 32 max)
Note 1: Specifying the PLC number enables access of the specified Sequencer CPU Mod-
ule on the MELSECNET or Ethernet network.
Note 2: Sending data using slave-initiated communications from the Sequence CPU Unit to
the Host (on-demand function) is not supported.
Communications method RS-232C, RS-422A (4-wire, half-duplex)
Synchronization method Start-stop synchronization
Transmission code ASCII
Data length 7, 8 bits
Note: 8-bit units with “0” added to the beginning of the 7-bit code
Stop bits 1, 2 bits
Error detection method Horizontal parity (none, 1 bit)
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