Allen-Bradley MicroLogix 1200 Reference Manual

Publication 1762-RM001C-EN-P
Using High-Speed Outputs 6-19
instruction is actually being executed by a parallel system, the status bits
and other information are updated each time the PWM instruction is
scanned while it is running. This provides the control program access to
PWM status while it is running.
Pulse Width Modulation
(PWM) Function File
Within the PWM function file are two PWM elements. Each element can
be set to control either output 2 (O0:0/2 on 1762-L24BXB, 1762-L40BXB,
and 1764-28BXB) or output 3 (O0:0/3 on 1764-28BXB only). Function file
element PWM:0 is shown below.
NOTE
PWM status is only as fresh as the scan time of the
controller. Worst case latency is the maximum scan of the
controller. This condition can be minimized by placing a
PWM instruction in the STI (selectable timed interrupt)
file, or by adding PWM instructions to your program to
increase how often a PWM instruction is scanned.

Allen-Bradley MicroLogix 1200 Specifications

General

Series	MicroLogix 1200
Type	Programmable Logic Controller (PLC)
Mounting	DIN rail or panel mount
Programming Language	Ladder Logic
Programming Software	RSLogix 500
I/O Points	Up to 40
Communication Ports	RS-232, RS-485
Memory	6 KB user memory
Power Supply	24V DC or 120/240V AC
Expansion	Supports expansion I/O modules
Operating Temperature	0°C to 55°C (32°F to 131°F)
Dimensions	90 mm x 110 mm
Weight	0.5 kg (1.1 lbs)