LG Electronics 120S user manual Communication Functions Instruction, Example of program, Sndcom

Chapter 8 Communication Functions

8.2.3 Instruction

1) User defined communication instruction(SNDCOM)

SNDCOM

User defined communication instruction

Instruction

Available Device

No. of

Flag

steps

M

P

K

L

F

T

C

S

D

#D

integer

Error

Zero

Carry

(F110)

(F111)

(F112)

Ch

○

7

○

n1

○

○

○

○

○

○

○

○

○

○

D

○

○

○

○

○

○

Flag Set

Error	Error flag turns on when designating area is
(F110)	over and the instruction isn’t executed

Designation

Ch	Designated communication channel
n1	Frame lists which is designated at parameter
D	Device which the communication status is stored

■ SNDCOM Ch n1 D

(1)Function

•When the execution condition is on, the communication starts with protocol at parameter which is designated early.

•‘Ch’ is communication channel and ‘n’ is a frame number at parameter which is designated

•‘D’ is a device which the communication status is stored.

(2)example of program

•When input condition is on, channel 1 stars communication with protocol at user defined parameter rnumber 3.

•The communication state is stored M000 and the format of M000 Iis as below

bit 15 bit 8 bit 1 bit 0

Error code (1 byte) Error bit Done bit

•Done bit : When transfer is completed normally, this bit turns on during 1 scan.

•Error bit : When communication error occurs, ,this bit turns on.

•Error code : When error bit turns on, the error code is stored.

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