Message Structure When Communicating Data Among Target Devices - Mitsubishi Electric MELSEC iQ-R Series User Manual

Message structure when communicating data among target
devices
Determine the message structure to communicate data among target devices by any of the following.
This is determined to provide interlocks among the other target devices so that each of them can communicate data with CPU
module on a 1:1 basis.
Same message structure as control procedure format frame
■Use an unset number for "Station No." and "Self-station No." in a message.
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 target device numbers.
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 transmission destination device.
• Self-station No.: Designate the number of the transmission source device. (No designation necessary when 1C frame is
used.)
Ex.
When the m:n configuration is 5:27
The values in ( ) indicate the respective station number of the target device and C24. (decimal: hexadecimal)
(27: 1BH) (28: 1CH)
Target device Target device
-1-
(0: 00H) (1: 01H)
CPU C24 CPU C24
The above C24 includes Q series C24, L series C24, QC24(N), and UC24.
(3C frame format 1)
E
N
Q
H L H L H L H L H
F 9 1 C 0 0 F F 1
05H 46H 39H 31H 43H 30H 30H 46H 46H 31H 42H
-2-
(2: 02H) (3: 03H)
CPU C24 CPU
L
B
18 DATA COMMUNICATIONS BETWEEN TARGET DEVICE AND CPU MODULE IN M:N BASIS
(31: 1FH)
Target device
-5-
(26: 1AH)
C24 CPU C24
18.2 Arrangement for Interlock among Target Devices
18
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