GSK 980TC3 Series, Руководство пользователя

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Chapter 5 PLC Functional Code
41
Ⅰ
Programming
5.20 SFT
（
Shift Register
）
Function:
This instruction can each time shift a byte data (8 bits) by a bits number set by a Parameter, For
the circular shifting, each overflowing "1" will be added reversely, i.e. If the highest bit "1" is
overflowed by the left shifting, so the lowest bit will be filled by "1", vice versa.
Format
：
DIR
（ W ）
CONT
RST
ACT
SFT
S1
Address
of shift
data
Length
Format
designation
Fig.5-20-1
Control conditions:
Shift direction specification (DIR)
DIR=0: Left shift
DIR=1: Right shift
Condition specification (CONT)
CONT=0: do not cycle shift
CONT=1: cycle shift
Reset
（
RST
）
The shifted out data(W=1) is reset (W=0).
RST=0: W is not reset.
RST=1: W is reset (W=0).
Actuation signal (ACT)
ACT=0: do not execute SFT instruction.
ACT=1:shifting processing is done when ACT=1. For shifting one bit only, execute an
instruction when ACT=1, and then, set ACT to 0.
Parameter:
S1
：
set the big shift data address which consists of a storage area with one byte.
Length ： a 4-digit number ， its definition is shown below: