Yokogawa Data Acquisition with PID Control CX2000 - Manual (Page 127)

5-17
IM 04L31A01-17E
5
Ladder Communication Protocol
• Write processing: If M602 is set, write the CH1 data to communication register C1.
M602 X27 Y27
627 MOVP H5 D0
MOVP H102 D1
MOVP H1 D2
MOVP D104 D4
Tx flag 2 Tx end Tx request
<Set CPU NO. “1” and station address No.>
D register
First No.
D register
First No.
CPU address
Num. of Tx data
<Specify first call register No. 0001 of the CX>
Read/write
Read/write
Specify CH1 Num. of data
to be read/
write data
Num. of data
to be read/
write data
<Specify write execute. Send “10”>
MOVP H10 D3
<Swap the upper and lower bytes of D2>
SWAPP D2
<Send CH1 data to write data>
SWAPP D3
SWAPP D4
<Declare num. of Tx data to be 5>
<Swap the upper and lower bytes of D4>
MOVP H0A0D D5
Num. of Tx data
Terminator
TOP H2 H800 D0 K6
<Transfer the contents of D0 to D5 to the Tx buffer>
SET Y27
Tx request
Tx request
Rx processing of response received from the CX
<Set Tx request>
X27
822 RST Y27
Tx end
<Reset Tx request when Tx end>
X2A
840 FROMP H2 H0A00 D130 K1
FROMP H2 H0A01 D131 K0Z0
MOVP H100 Z0
Read
request
flag
Rx read
end
Data size
CJ P124
Y28
= K2 CO
Interval
counter
5.5 Communication Program for MELSEC