Allen-Bradley MicroLogix 1000 User Manual

Preface
MicroLogix 1000 Programmable Controllers User Manual
B–26
Execution Time Worksheet
Use this worksheet to calculate your execution time for ladder program.
________ µs
_______
Procedure Maximum Scan Time
1. Input scan time, output scan time, housekeeping time, and forcing.
2. Estimate your program scan time:
A.
Count the number of program rungs in your logic program and multiply by 6.
B. Add up your program execution times when all instructions are true. Include interrupt
routines in this calculation.
➀
3. Estimate your controller scan time:
A. Without communications, add sections 1 and 2
B. With communications, add sections 1 and 2 and multiply by 1.05
4. To determine your maximum scan time in ms, divide your controller scan time by 1000.
210 µs (discrete)
330 µs with forcing (analog)
250 µs without forcing (analog)
________ µs
________ ms
________ µs
________
➀
If a subroutine executes more than once per scan, include each subroutine execution scan time.
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Allen-Bradley MicroLogix 1000 Specifications

General

Communication Ports	RS-232
Power Supply	24V DC or 120/240V AC
Programming Software	RSLogix 500
Manufacturer	Allen-Bradley
Category	Controller
Series	MicroLogix
Programming Language	Ladder Logic
Input Voltage	24V DC or 120/240V AC
I/O Points	10 to 32 points
Processor Type	8-bit
Operating Temperature	0…55 °C (32…131 °F)
Processor	8-bit