Hitachi EH-150 Series - Page 75

Chapter 6 Communication Mode
6 - 33
Modbus Master
 Sample program [Initial setting]
(1) Ladder program
[EH-CPU]
[EHV-CPU]
* This is a sample program for initial setting. When communicating, it is necessary to add the communication
program to the above sample program. Please refer to the sample program of “Query transmission, Response
receiving” for details.
TRNS 9 ( WY325 , WR0 , M0 )
WR7 = H0000 … Initial setting command
WR8 = 200 … Command timeout time
DR9 =ADR(WR100) … I/O address of sending data area
( WR100 )
DRB = ADR(WR200) … I/O address of receiving data area
( WR200 )
WRD = H0400 … Size of receiving data area
R7E3
s parameter
TRNS 9 command
WR100 = H0006 … No. of send data (byte)
WR101 = H0010 … Communication mode
WR102 = H0000 … Modbus transmission mode
WR103 = 50 … Receiving timeout time
R7E3
Sending data area
(Parameter for initial
setting)
R7E3
M0
S
DIF
TRNS 9 command
execution
TRNS 9 ( WY325 , WR0 , M0 )
WR7 = H0000 … Initial setting command
WR8 = 200 … Command timeout time
WR9 = H000A I/O address of sending data area
WRA = H0100 ( WR100 )
WRB = H000A I/O address of receiving data area
WRC = H0200 ( WR200 )
WRD = H0400 … Size of receiving data area
WR100 = H0006 … No. of send data (byte)
WR101 = H0010 … Communication mode
WR102 = H0000 … Modbus transmission mode
WR103 = 50 … Receiving timeout time
S
DIF1
R7E3
R7E3
M0
R7E3
s parameter
Sending data area
(parameter for initial
setting)
TRNS 9 command
TRNS 9 command
execution