Allen-Bradley MicroLogix 1100 Instruction Set Reference Manual

Publication 1763-RM001C-EN-P - October 2009
176 Timer and Counter Instructions
CTD Instruction Counter Control and Status Bits, Counter Word 0
(Data File 5 is configured as a timer file for this example.)
Bit Is Set When: And Remains Set Until One of the Following
Occurs:
bit 11 - C5:0/UN UN - underflow
indicator
the accumulated value wraps from -32,768
to +32,767 and continues to count down
a RES instruction with the same address as the CTD
instruction is enabled
bit 13 - C5:0/DN DN - done
indicator
accumulated value
≥ preset value •accumulated value < preset value or,
•a RES instruction with the same address as the
CTU instruction is enabled
bit 14 - C5:0/CD CD - count down
enable
rung state is true •rung state is false
•a RES instruction with the same address as the
CTD instruction is enabled
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Allen-Bradley MicroLogix 1100 Specifications

General

Processor	32-bit
Programming Software	RSLogix 500
Mounting	DIN rail or panel mount
Power Supply	24V DC
Type	Compact PLC
Digital Inputs	12
Digital Outputs	8
Analog Inputs	4 (depending on model)
Analog Outputs	Optional with expansion module
Programming Language	Ladder Logic
Operating Temperature	0 to 55 °C (32 to 131 °F)
Series	MicroLogix