MAN0974-14-EN_XL7_XL7P_UM
July 6, 2022
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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 XL7/XL7 PRIME 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 (Digital DC Input / Output sections).
The OCS contains a
Field-Programmable Gate Array
(
FPGA
), which is an integrated configurable circuit
that allows the XL7/XL7 PRIME to be programmed to have either two high-speed counters or four high-
speed counters. The XL7/XL7 PRIME 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
