Allen-Bradley MicroLogix 1400 User Manual

545 Publication 1766-RM001A-EN-P - October 2008
Appendix A
MicroLogix 1400 Memory Usage and Instruction
Execution Time
This appendix contains a complete list of the MicroLogix 1400
programming instructions. The list shows the memory usage and
instruction execution time for each instruction. Execution times using
indirect addressing and a scan time worksheet are also provided.
Programming
Instructions Memory
usage and Execution
Time
The tables below lists the execution times and memory usage for the
programming instructions. These values depend on whether you are
using word or long word as the data format.
MicroLogix 1400 Controllers -
Memory Usage and Instruction Execution Time for Programming Instructions
Programming Instruction Instruction
Mnemonic
Word Long Word
Execution Time in µs Memory
Usage in
Words
Execution Time in µs Memory
Usage in
Words
True False True False
ASCII Test Buffer for Line ABL 21.5621 1.8710 1.14 None None None
Absolute Value ABS 1.4410 0.3750 1.14 1.5390 0.3730 None
ASCII Number of Characters in
Buffer
ACB 22.6154 3.5250 1.14 None None None
ASCII String to Integer ACI 6.5719 0.2142 1.14 7.1146 0.1978 None
ASCII Clear Buffer ACL (both) 26.5540 0.4500 1.57 None None None
ASCII Clear Buffer ACL
(receive)
7.8820 0.3848 1.57 None None None
ASCII Clear Buffer ACL
(transmit)
5.8590 0.3706 1.57 None None None
ASCII String Concatenate ACN 9.4852 0.1982 1.57 None None None
Arc Cosine ACS 18.0150 0.3750 1.14 18.3070 0.4150 None
Add ADD 1.8868 0.3540 1.57 1.7807 0.3546 None
ASCII String Extract AEX 10.0290 0.1850 2.00 None None None
ASCII Handshake Lines AHL 26.5267 2.9480 2.00 None None None
ASCII Integer to String AIC 8.3032 0.2591 1.14 9.8913 0.2155 None
And AND 1.7894 0.3781 1.57 1.8185 0.3967 None
ASCII Read Characters ARD 9.3760 7.7770 1.57 None None None
ASCII Read Line ARL 33.9910 8.5690 1.57 None None None
ASCII String Search ASC 8.0844 0.1984 2.00 None None None
Arc Sine ASN 42.4610 0.3870 1.14 43.1010 0.3790 None
ASCII String Compare ASR 4.8596 0.2016 1.14 None None None
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Allen-Bradley MicroLogix 1400 Specifications

General

Processor	32-bit
Expansion Modules	Up to 7 expansion I/O modules
Power Supply	24V DC or 120/240V AC
Programming Software	RSLogix 500
Communication Ports	Ethernet, RS-232/RS-485 combo port
Controller Type	Programmable Logic Controller (PLC)
Series	MicroLogix
Digital Outputs	12
Analog Inputs	6 (embedded)
Analog Outputs	2 (embedded)
High-Speed Counter	6 high-speed counters
Pulse Output	2 (embedded)
Ethernet Port	Yes