MAN0964-14-EN_XL4_XL4P_UM
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CHAPTER 9: HIGH SPEED I/O (HSC / PWM)
9.1
Overview
In addition to the compliment of simple analog and digital I/O, several of the XL4/XL4 PLUS
OCS I/O modules support High Speed Counting (HSC) I/O functions and may also support
Pulse Width Modulation (PWM) Output functions (non-relay modules). The HSC functions
include internal timing, frequency, totalizing, pulse width/period, and quadrature
measurement. The PWM functions include traditional PWM (with variable rate and duty cycle)
and a stepper (limited functionality) with variable acceleration and deceleration rates. To
determine function availability, refer to the associated model’s Specification/Installati
on sheet
(Digital DC Input / Output sections).
The OCS contains a Field-Programmable Gate Array (FPGA), which is an integrated
configurable circuit that allows the XL4/XL4 PLUS to be programmed to have either two high-
speed counters or four high-speed counters. The XL4/XL4 PLUS ships with two high-speed
counters, but a customer can contact Horner Technical Support to receive a file that will
configure the unit to have four. These modes are not supported simultaneously. Two counter
mode supports Quadrature mode and two stepper outputs, while four counter mode does not
support Quadrature mode and supports only one stepper output.
This chapter describes the operation of these high level I/O functions. For configuration
details of these functions, see
Cscape Configuration
.