75
CHAPTER 2 APPLICATION OF PROGRAMMING
2
2.11 Communications with Intelligent Function Modules
(2) Communications with the FROM and TO instructions
The FROM instruction stores data read from the buffer memory of the intelligent function module to the specified
device.
The TO instruction writes data stored in the specified device to the buffer memory of the intelligent function
module.
For details on the FROM and TO instructions, refer to the following.
MELSEC-Q/L Programming Manual (Common Instruction)
(3) Communications using the intelligent function module device
The intelligent function module device represents the buffer memory of the intelligent function module as one of
the CPU module devices. ( Page 253, Section 5.4.1)
The difference from the FROM and TO instructions is that, with this device, both reading and writing data from
and to the intelligent function module cab be processed with one instruction.
(4) Communications using the intelligent function module dedicated instruction
This instruction enables easy programming for the use of functions of the intelligent function module.
Serial communication module dedicated instruction (OUTPUT instruction)
The OUTPUT instruction allows communications with external device by nonprocedural protocol regardless of the
buffer memory address of the serial communication module.
(a) Processing of the intelligent function module dedicated instruction
When using multiple intelligent function module dedicated instructions to one intelligent function module,
execute the dedicated instructions one by one after the completion device turns on. This completion device
turns on for one scan when an instruction is completed. If the CPU module status is changed from RUN to
STOP before the completion device turns on, the completion device does not turn on until one scan after the
next RUN of CPU module.
For details on the intelligent function module dedicated instructions and the completion device, refer to the
following.
Manual for the intelligent function module used
Ex.
Ex.
b15 b0
to
S2
+ 0
+ 1
+ 2
CPU module Serial communication module
Channel 1
Channel 2
Send
Send
Set channels to be used in
control data.
To Next Page
Loading...
Need help?
General
