Rockwell Automation 1785-LTx,D17856.2.1 Classic PLC-5 Programmable Controllers Users Manual User Manual
Page 125
Calculating Program Timing
Chapter 9
9-8
Bit and Word Instructions for PLCĆ5/10, Ć5/12, Ć5/15, and Ć5/25
Processors
Table 9.N shows timing and memory requirements for bit and word
instructions for PLC-5/10, -5/12, -5/15, and -5/25 processors.
Table 9.N
Timing and Memory Requirements for Bit and Word Instructions
for PLCĆ5/10, Ć5/12, Ć5/15, and Ć5/25 Processors
Category
Code
Title
Execution Time (
µ
s)
Integer
True
False
Execution Time (
µ
s)
Floating Point
True
False
Words of
Memory
2
Relay
XIC
examine if closed
1.3
0.8
1
1
XIO
examine if open
OTL
output latch
1.6
OTU
output unlatch
OTE
output energize
1.6
1.6
Branch
branch end
0.8
0.8
1
next branch
branch start
Timer and Counter
TON
timer on (0.01 base)
(1.0 base)
39
44
27
28
2Ć3
TOF
timer off (0.01 base)
(1.0 base)
30
30
43
51
RTO
retentive timer on
(0.01 base)
(1.0 base)
39
44
24
24
CTU
count up
32
34
CTD
count down
34
RES
reset
30
14
1
For every bit address above the first 256 words of memory in the data table, add 0.8
µ
s to the execution time and 1 wordd of memory to the requirements.
2
Use the smaller number if all addresses are below word 4096; use the larger number if all addresses are above 4096.
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