Message Structure When Communicating Data Between External Devices - Mitsubishi MELSEC L Series User Manual

14 DATA COMMUNICATIONS USING EXTERNAL DEVICE AND PROGRAMMABLE CONTROLLER CPU M : N CONFIGURATION

14.2.2 Message structure when communicating data between external devices

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The message structure when communicating data between external devices is
determined by any of the following.
This condition is determined to provide interlocks between the external devices so that
each of them can exchange data with the programmable controller CPU in a 1:1
configuration.
(1) When making the message structure the same as that of each
control procedure format frame
1) Use a number within the [0] to [31] (00
C24 on the programmable controller CPU side as the external device No. in
the [Station No.] and [Local station No.] items in the message.
2) Select and designate the external device numbers.
The designation method is described in "Contents of the data designation
items" of each frame in the MELSEC-Q/L MELSEC Communication Protocol
Reference Manual.
• Station No. ..................... Designates the number of the transmission
• Local station No. ............ Designates the number of the transmission
(Example) When m : n configuration is 5:27
The values in (
station numbers (decimal: hexadecimal)
(27: 1B
H
External
device
-1-
(0: 00 )
H
CPU C24 CPU
(QnA Compatible 3C frame format 1)
E
N
Q
H L H L H
F 9 1 C 0
05 46 39 31 43 30 30
H H H H H H
destination external device.
source external device. (Does not have to be
designated when A compatible frame 1C is used.)
) are the external device and the Q series C24
) (28: 1C )
H
External
device
-2-
(1: 01 ) (2: 02
H
C24 CPU
L H L H L
0 F F 1 B
46 46 31 42
H H H H H
to 1F ) range not set to the Q series
H H
(31: 1F
External
device
-5-
) (3: 03 )
H H
C24 CPU C24
C24: Q series C24, QC24(N), UC24
)
H
(26: 1A )
H
CPU C24
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