Allen-Bradley MicroLogix 1400 User Manual

Publication 1766-RM001A-EN-P - October 2008
128 Using the High-Speed Counter and Programmable Limit Switch
The outputs shown in the black boxes are the outputs under the control
of the HSC sub-system. The mask defines which outputs can be
controlled. The high preset output or low preset output values (HPO or
LPO) define if each output is either ON (1) or OFF (0). Another way to
view this is that the high or low preset output is written through the
output mask, with the output mask acting like a filter.
The bits in the gray boxes are unused. The first 6 bits of the mask word
are used and the remaining mask bits are not functional because they do
not correlate to any physical outputs on the base unit.
The mask bit pattern can be configured only during initial setup.
O0:0.0 0 1 0 1 0 1
Affect of HSC Output Mask on Base Unit Outputs
Output Address 16-Bit Signed Integer Data Word
1514131211109876543210
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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