Comrf (Communication Refresh) - IDEC MICROSmart FC6A Series Ladder Programming Manual

COMRF (Communication Refresh)

COMRF
Example: COMRF
The following example demonstrates a program to execute COMRF instructions among other instructions.
RXD
3
M0
BMOV(W)
M1
TXD
4
Execute reading of received data and writing of send data for port 2 and 3 (communication port refresh) during user
program processing.
When implementing an application that requires a communication response from the communication cartridge in a
time interval that is shorter than the scan time of FC6A Series MICROSmart, program it with the COMRF instruction.
Regardless of the presence of the COMRF instruction, reading received data and writing send data for expanded
communication port is executed in END processing.
Note: This instruction cannot be used in interrupt programs. If this instruction is used in an interrupt program, a user
program execution error will occur.
For user program execution errors, see "User Program Execution Errors" on page 3-10.
COMRF
S1 D1 D2
100 M1 D498
S1 N-W D1
D0 100 D500
S1 D1 D2
100 M0 D502
R
M1
COMRF
FC6A S MICROS
ERIES MART
Before executing the RXD instruction, COMRF refreshes send and receive data of
the expansion communication ports.
After executing the TXD instruction, COMRF refreshes send and receive data of
the expansion communication ports.
L P M
ADDER ROGRAMMING ANUAL
14: R
EFRESH
FC9Y-B1726
I
NSTRUCTIONS
14-5