Rockwell Automation 1785-LTx,D17856.2.1 Classic PLC-5 Programmable Controllers Users Manual - 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.