Rockwell Automation 1785-LTx,D17856.2.1 Classic PLC-5 Programmable Controllers Users Manual User Manual
Page 131
Calculating Program Timing
Chapter 9
9-14
Table 9.P
Additional Execution Time Based on Source and Destination Addresses
Data Type
Source
(integer to floating point)
Destination
(floating point to integer)
0Ć2K
2Ć4K
4K+
0Ć2K
2Ć4K
4K+
Integer
0
1
2
0
1
2
Floating point
0
3
4
0
3
4
Data conversion 8
9
10
33
34
35
When file addresses (# prefix) in the expression or destination address
contain indirect addresses for file numbers, add:
45
µ
s
when the indirect address is integer type
48
µ
s
when the indirect address is floating point type
48
µ
s
when the indirect address is timer, counter, or control type
When file addresses in the expression or destination contain indirect
addresses for element numbers, add:
45
µ
s
when the indirect address is integer type
46
µ
s
when the indirect address is floating point type
46
µ
s
when the indirect address is timer, counter, or control type
If the file address contains two indirect addresses, add only one value (the
largest). For example, for #F[N7:20][N7:30], add 48
µ
s (indirect floating
point file address).
Multiply the additional time by the number of elements in the file for any
type of file or file address. For one FAL example:
Expression:
#N[N7:100]/10 * F8:20
add 10 for converting to floating point
add 45 for indirect address
Destination:
#N7:30
add 35 for converting to integer
FAL multiply:
98 + W[42.5 + N + indirect addressing]
N = 2(2) +8 (1) + 6(0) + 10 + 35 = 57
W = 16
Execution time
in ALL mode:
98 + 16[42.5 + 57 +45]
2410
µ
s