Mitsubishi Electric FX5 User Manual page 77

■Sample program
<<Connection No.1 open processing (Active)>>
M1000 SD10680.0 SD10681.0
M100 M101
M101
<<Data send processing>>
M3000 SD10680.0
M300 M301
M301
<<Data receive processing>>
SD10680.0 SD10682.0 M500
M500 M501
M501
<<Connection No.1 close processing>>
SD10680.0 SD10681.0
M4000 SD10680.0 M4004
M4001
M200 M201
M201
■Precautions for Active open communication
Configure an interlock circuit using the Open completion signal (SD10680.n) and Open request signal (SD10681.n) in the
program.
The following chart shows on/off timings of the Open completion signal and Open request signal.
Open completion signal (SD10680.n)
Open request signal (SD10681.n)
SP.SOCOPEN
SP.SOCSND "U0"
SP.SOCRCV "U0"
SP.SOCCLOSE "U0"
<<When cut from the CPU module>>
ON
OFF
ON
OFF
SOCOPEN instruction
.... <<When disconnected by the target device>>
....
Set execution type/completion type to 0
MOVP H0 D100
"U0" K1 D100 M100 Execute connection 1 open
Normal completion indication
SET M1002
Error completion indication
SET M1003
Set length of the data to be sent
MOVP K6 D300
MOVP H3412 D301
Set the data to be sent
MOVP H7856 D302
MOVP H0BC9A D303
Sending data to connection 1
K1 D3000 D300 M300
Normal completion indication
SET M3002
Error completion indication
SET M3003
Receiving data
K1 D5000 D500 M500
SET M5002 Normal completion indication
Error completion indication
SET M5003
PLS M4001 Processing for disconnection from target device
K1 D200 M200 Close Connection 1
Set the closing flag
SET M4004
Normal completion indication
SET M4002
SET M4003 Error completion indication
Reset the closing flag
RST M4004
END
TCP disconnection completed upon the response from the target device
TCP disconnection request from the CPU module
SOCCLOSE instruction
TCP disconnection request from the target device
TCP disconnection completed upon the response from the CPU module
SOCCLOSE instruction
7 SOCKET COMMUNICATION FUNCTION
7.1 Communication Using TCP
7
75