Panasonic FPG-XY64D2P-A - Sample Program for Master Communication

FPΣ User's Manual
8.5 MEWTOCOL-COM
185
Connection diagram for FPG-COM4
SG
+
-
SD
RD


1
To external device with RS485 port
Connect two cables each to the (+) and (-) terminals. Use wires with the same cross-sectional
area (0.5 to 0.75 mm
2
).
Bus termination
FPΣ FPΣ FPΣ FPΣ


1
To converter for RS232C connection of computer
2
Transmission line
Set SW1-1 to ON on the first and on the last station of the transmission line to terminate the
data bus. (See "
DIP Switch Setting on FPG-COM4" on page 162.)
8.5.7 Sample Program for Master Communication
Use the F145_WRITE and F146_READ instructions for the MEWTOCOL-COM master
function. Be sure to set the COM port used in the program to "MEWTOCOL-COM
Master/Slave" in the system registers.
GVL
POU Header
In order to have consistent data in the master project and in the slave project, the common
data should be kept in the GVL of a common library.