Rockwell Automation 1772-LS_LSP,D17726.8.6 PROG/OPER MANUAL-MINI PLC-2/05 User Manual
Page 51
Scan Theory
Chapter 5
5Ć4
Add the execution values for each instruction by using Table 5.A. The sum of
these values added to the I/O scan time is the average scan time.
Table 5.A
Approximate Execution Time Per Scan (in average microseconds)
Instruction Name
Symbol
Instruction
True
Instruction
False
Examine on, Examine off
Ć| |Ć,Ć| / |Ć
14
11
Output energize
Ć( )Ć
16
16
Output latch
Ć(L)Ć
17
13
Output unlatch
Ć(U)Ć
17
13
Get
Ć[G]Ć
28
Ć
Put
Ć(PUT)Ć
26
14
Equal
Ć(=)Ć
23
11
Less than
Ć(<)Ć
25
13
Get byte
Ć|B|Ć
16
Ć
Limit test
Ć|L|Ć
24
11
Counter reset
Ć(CTR)Ć
20
14
Retentive timer reset
Ć(RTR)Ć
20
14
Timer onĆdelay
Ć(TON)Ć
75
47
Retentive timer onĆdelay
Ć(RTO)Ć
78
48
Timer offĆdelay
Ć(TOF)Ć
82
60
Up counter
Ć(CTU)Ć
70
55
Down counter
Ć(CTD)Ć
75
60
3 Digit Math
Add
Ć(+)Ć
48
15
Subtract
Ć(Ć)Ć
80
19
Multiply
Ć(x)Ć(x)Ć
615
60
Divide
Ć(
÷
)Ć(
÷
)Ć
875
60
Add to any of the above when its
address is 4008 or greater
27
27
Expanded Math
Add
EAF 01
400Ć500
40
Subtract
EAF 02
400Ć500
40
Multiply
EAF 03
800Ć2250
40
Divide
EAF 04
500Ć3250
40
Square root
EAF 05
1850
40
BCD to binary
EAF 13
500
40
Binary to BCD
EAF 14
500
40
Master control reset
Ć(MCR)Ć
16
16
Zone control last state
1
Ć(ZCL)Ć
22(no skip)
20+(13 per word skipped)
Branch start
16
16
Branch end
18
18
End, temporary end
T.END
27
27
Subroutine area
SBR
27
27
Immediate input update
Ć[ I ]Ć
45 (with forcing on 55)
Ć
Immediate output update
Ć(IOT)Ć
70(with forcing on 80)
17