IDEC MICROSmart FC6A Series Ladder Programming Manual

FC6A S ERIES MICROS MART L ADDER P ROGRAMMING M ANUAL FC9Y-B1726 14-5
14: R EFRESH I NSTRUCTIONS
COMRF (Communication Refresh)
Example: COMRF
The following example demonstrates a program to execute COMRF instructions among other instructions.
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
Before executing the RXD instruction, COMRF refreshes send and receive data of
the expansion communication ports.
M0
S1
100
D1
M1
RXD
3
D2
D498
M1
S1
D0
N-W
100
BMOV(W) D1
D500
COMRF
S1
100
D1
M0
TXD
4
D2
D502
COMRF
M1
R
After executing the TXD instruction, COMRF refreshes send and receive data of
the expansion communication ports.

IDEC MICROSmart FC6A Series Specifications

General

Brand	IDEC
Model	MICROSmart FC6A Series
Category	Computer Hardware
Language	English