MAN0974-11-EN_XL7_UserManual
March 22
nd
, 2020
Page 85 | 195
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 XL7 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/Installation sheet (Di
gital DC Input /
Output sections).
The OCS contains a Field-Programmable Gate Array (FPGA), which is an integrated
configurable circuit that allows the XL7 to be programmed to have either two high-speed
counters or four high-speed counters. The XL7 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