Mitsubishi MELSEC LJ71C24, User Manual

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12 DEDICATED INSTRUCTIONS
12.2 G(P).ONDEMAND
Data can be sent using the on-demand function of the MC protocol.
Applicable device
Internal device
(System, user) Link direct device
J \
Setting
data
Bit Word
File register
Bit Word
Intelligent function
module device
U \G
Index register
Zn
Constant Others
(S1) — —
(S2) — —
(D) —
Command
Command
[Executing
condition]
[Instruction
code]
G.ONDEMAND
GP.ONDEMAND
(D) (S1) (S2)
G.ONDEMAND Un
GP.ONDEMAND
Un
(S1) (S2) (D)
Setting data Description Set by Data type
Un
Start I/O signal of the module
(00 to FE: Top two-digit when I/O signals are expressed in 3-digit.)
User BIN16-bit
(S1) Head number of the devices in which control data is stored. User, system
(S2) Head number of the devices in which transmission data is stored. User
Device name
Setting data
(D) Bit device number to be turned on at completion of execution. System Bit
The file register per local device and program cannot be used as the set data.
Control data
Device Item Setting data Setting range Set by
3
(S1) + 0 Transmission channel
• Set transmission channel
1: Channel 1 (CH1 side)
2: Channel 2 (CH2 side) 1, 2 User
(S1) + 1 Transmission result
• Result read by an ONDEMAND instruction is stored.
0: Normal
Other than 0: Error code
1
— System
(S1) + 2 Transmission data count
• Set the transmission data count.
2
1 or more User
1 For error codes relating to abnormal completion, refer to Chapter 15.
2 When setting "Word/byte units designation" by GX Works2, set the number of bytes
when bytes are designated and set the number of words when words are
designated.
3 The settings are done by either of the following:
• User : Data set by the user before executing the ONDEMAND instructions.
• System : The CPU module stores the execution result of the ONDEMAND
instructions.