Allen-Bradley PLC-2/30

Timer and Counter Instructions
Chapter 5
519
Figure 5.13
Program
for Determining A verage Scan T ime
( CTU )
050
PR 999
AC 000
 ( CTU )
050
PR 999
AC 000
| / |
14
( R TO )
050 051
Branch End Instruction
||
14
( : )
050 Store 3
||
14
( R TR )
050 051
PR 999
AC 000
||
14
( CTR )
050 050
PR 999
AC 000
1
2
3
4
5
6
| G |
xxx
051
| G |
010
Store 1
0.1
PR 999
AC xxx
xxx
( : )
Store 2
xxx
•
To enable the programmer to estimate the scan time a proposed program
may require, the average execution times required for PLC-2/30
instructions are presented in Tables 5.D through 5.G.
Table 5.D contains average execution times for instructions.
5.6
Instruction Execution Time
5.6.1
Relay T ype, T imer and
Counter, Data
Manipulations, Arithmetic,
Output Override and I/O
Update, Jump, and
Subroutine Instructions
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