Campbell Scientific CR9000X Measurement and Control System - Manual (Page 50)

Overview
CR9071E Counter and Digital I/O Module
CR9071E COUNTER MADE IN USA
CR9071EC
COUNTER & DIGITAL I/O MADE IN USA
FIGURE OV1-13. CR9071E
The CR9071E is an "Easy Connect" module type, and includes a CR9071EC
(See Figure OV1-6). The CR9071E typically remains in the CR9000(X)
chassis while each CR9071EC remains connected to the sensors. This allows
one CR9000(X) system to be moved from location to location and be quickly
connected to the sensors on-site.
This module is the direct replacement module for the CR9070. It has improved
resolution, channel isolation, over-voltage input protection, as well as new
functionality.
The CR9071E Pulse Module has 16 Digital I/O channels and 12 Pulse
channels with 32 bit accumulators. The CR9071 is used for Pulse
measurements, as well as state monitoring and control.
CHANNEL DESCRIPTION
Digital I/O The CR9071E has 16 Digital I/O ports selectable, under program control, as
binary inputs or control outputs. These ports have multiple function capability
including: edge timing, TTL signal period or frequency measurements, device
driven interrupts, and, as shown in Figure OV1-13, state monitoring and
control (i.e.: turning on/off devices and monitoring whether the device is On or
Off). The Edge Timing resolution is 40 nanoseconds.
Digital I/O Ports Used to Control/Monitor Pump
C1 - Used as input to monitor pump status.
C2 - Used as output to switch power to a pump via a solid state relay.
FIGURE OV1-13. Control and monitoring of a device using digital I/O
ports
OV-18