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Chapter 5 Instruction Specifications
5-96
Item number Application instructions-24 Name Unit
Ladder format Condition code
Processing time (µs)
Remark
R7F4 R7F3 R7F2 R7F1 R7F0
Average Maximum
UNIT (d, s, n) DER ERR SD V C
↕
zzzz
Instruction format Number of steps
Condition Steps
As per the table
below.
UNIT (d, s, n) 4
Bit Word Double word
Usable I/O
XY
R,
M
TD, SS,
CU, CT WX WY
WR,
WM TC DX DY
DR,
DM
Constant
Other
d
Unity result write
destination I/O
{{
s Unity destination head I/O {
n
Numbers of words to be
united
{
n=0 to 4
Function
• Sets the values in the lower four bits of each of the n (1 to 4) words starting from s to the lower four bits of each word in d.
• If n is 1 to 3, the bits not set in d will be “0.”
• The data stored in s to s + n – 1 will be retained even if UNIT is executed.
• Use this instruction so that s + n - 1 does not exceed the I/O range (WRFFF and WM3FF). If it exceeds the I/O range, DER
is equal to '1' and the lower four bits within the range between s and I/O will be set in d.
s
s+1
s+2
s+3
B1
B2
B3
B4
B4 B3 B2 B1
d
When n is 1 : B2 to B4 of d are 0
When n is 2 : B3 to B4 of d are 0
When n is 3 : B4 of d is 0
W
hen n=4
Upper digits Lower digits
4 bits
Ignored
Notes
• When n=0, it is not executed.
• When n>5, it is not executed.
UNIT (d, s, n)
Processing time (µs)
n
Average Maximum
075
–
1 100
–
2 103
–
3 106
–
4 109
–