Allen-Bradley micrologix 1500 Reference Manual

Publication 1762-RM001C-EN-P
8-2 Timer and Counter Instructions
Each timer address is made of a 3-word element. Word 0 is the control
and status word, word 1 stores the preset value, and word 2 stores the
accumulated value.
EN = Timer Enable Bit
TT = Timer Timing Bit
DN = Timer Done Bit
Addressing Modes and File Types can be used as shown in the following
table:
Table 8.2 Timer File
Word Bit
1514131211109 8 76543210
Word 0 EN TT DN Internal Use
Word 1 Preset Value
Word 2 Accumulated Value
ATTENTION
!
Do not copy timer elements while the timer enable bit
(EN) is set. Unpredictable machine operation may occur.
Table 8.3 Timer Instructions Valid Addressing Modes and File Types
For definitions of the terms used in this table see Using the Instruction Descriptions on page4-2.
Parameter
Data Files
(1)
(1) Valid for Timer Files only.
Function Files
CS - Comms IOS - I/O
Address
Mode
Address
Level
O I S B T, C, R N ST L MG, PD RTC HSC PTO, PWM STI EII BHI MMI DAT TPI Immediate Direct Indirect Bit Word Long Word Element
Timer • • •
Time Base
• •
Preset
• •
Accumulator
• •
NOTE
Use an RES instruction to reset a timer’s accumulator and
status bits.

Allen-Bradley micrologix 1500 Specifications

General

Processor Type	16-bit
Programming Language	Ladder Logic
Mounting	DIN rail or panel mount
Programming Software	RSLogix 500
Communication Ports	RS-232
Power Supply	24V DC
Operating Temperature	0°C to 55°C (32°F to 131°F)
Controller Type	Programmable Logic Controller (PLC)