Campbell-scientific CR9000X Measurement and Control System Manual do Utilizador descarregar pdf (Página 48)

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101

Overview

CR9070 Counter - Timer / Digital I/O Module — Obsolete

9070 COUNTER & DIGITAL I O

1 2

DIGITAL I/O

45 78 9 10 12 13 15 16 1 2 3 4 5 6 7 8 9 10 11 12

MADE IN USA

3 6 11 14

LOW LEVEL AC SWITCH CLOSURRE

FIGURE OV1-12. 9070

The CR9070 has been replaced by the CR9071E, which provides better over-

voltage protection, increased channel-to-channel cross-talk isolation, interval

(edge) timing with 40 nanosecond resolution, and a Wait Digital Trigger

function.

The CR9070 Pulse Module has 16 Digital I/O channels and 12 Pulse channels

with 16 bit accumulators. The CR9070 is used for Pulse measurements, as

well as state monitoring and control.

CHANNEL DESCRIPTION

Digital I/O

The CR9070 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 limited to the logger's Scan Interval.

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-16

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