18 DATA COMMUNICATIONS BETWEEN TARGET DEVICE AND CPU MODULE IN M:N BASIS
18.1 Considerations on Data Communications
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Numbers designated for "Station No." and "Self-station No."
Designate the numbers below for "Station No." and "Self-station No." in the command message transmitted from the target
device for data communications in the m:n system configuration.
■When accessing to C24
■When accessing to other device (communications for interlock)
*1 The number which has not been set to the respective C24s on the CPU module side is used within the range of "0" to "31" (00H to 1FH)
as the number for the target device side in "Station No." and "Self-station No." in the message.
Select and designate the number of each target device.
The designation method is as shown in 'Contents of the data designation items' of each frame.
( MELSEC Communication Protocol Reference Manual)
Station No.: Designate the number of the transmit destination device.
Self-station No.: Designate the number of the transmit source device. (No designation necessary when 1C frame is used.)
Item Communications with 2C/3C/4C frame Communications with 1C frame
Station No. Station number of C24 to be passed through
Self-station No. Station number of access source target device
*1
No designation necessary (No "Self-station No." item)
Item Communications with 2C/3C/4C frame Communications with 1C frame
Station No. Station number of access destination device
*1
Self-station No. Station number of access source device
*1
No designation necessary (No "Self-station No." item)
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