9. Program
50
s Data Flow
s the data flow from when the PLC (SCU Unit) issues command data
to the destination device until when the PLC (SCU Unit) receives the response data from the
9.1.1. Communication
The following figure show
destination device.
1. Executing the
communications sequence
The PLC executes a protocol macro instruction
(Instruction: PMCR) with a sequence No. specified in
the program, and loads the communications
sequence (protocol macro data) registered in the SCU
Unit.
↓
2. Sending a command The SCU Unit issues a send message (command
data) to the destination device based on the
sequence No. specified in 1.
↓
3. Receiving a response
The SCU Unit stores the response data, which was
received from the destination device, in the specified
internal memory of the CPU Unit.
9.
send/receive message.
1.2. PMCR Instruction and Send/Receive Message
This section outlines the protocol macro instruction (Instruction: PMCR, hereinafter referred to
as the PMCR instruction) and the general operation of the
Additional Information
Please refer
to Serial Communication Instructions (PMCR) of Section 3 Instructions in th
CJ-series Instructions Reference Manual (Cat.No. W474) for details.
e
PMCR instruction operand data
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