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5 non, Isolated pulse counter/discrete inputs on tb5 of, Cpu/system controller board – Emerson Process Management Bristol ControlWave ExpressPAC User Manual

Page 56

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ControlWave ExpressPAC Instruction Manual (CI-ControlWave EPAC)

3-10

I/O Configuration and Wiring

Revised Mar-2011

3.3.5 Non-Isolated Pulse Counter/Discrete Inputs on TB5 of

CPU/System Controller Board

CPU/System Controller board connector TB5 provides interface to two
internally sourced open collector pulse counter/discrete inputs (Pulse1
and Pulse2) with a 1 second scan rate. Pulse counters act like high speed
counters but cannot function with contact relays because they lack
contact debounce circuitry.

Table 3-7. Non-Isolated Pulse Counter/Discrete Inputs General
Characteristics

Type Number

Supported

Characteristics

Pulse Counter /
Discrete Inputs

2 on TB5 of

CPU/System

Controller

board

Signal conditioning circuitry provides

20 microsecond filtering.

Surge suppression.

Maximum input frequency for each

pulse counter/discrete input circuit is
10 KHz.

Wiring Pulse counter/discrete inputs are field driven by open collector circuits

and are sourced for 3.3V (internally) with a 200μA source current. See
Figure 3-3 for information on the open collector wiring arrangement.

Figure 3-3. Pulse Input Wiring Diagram

Software Configuration To use data from these pulse counter/discrete inputs you must include

a CWM_ECPU board in your ControlWave project using
ControlWave Designer’s I/O Configurator, and then configure it. See
the ControlWave Designer Programmer's Handbook (D5125) for more
information. That same manual includes an I/O Mapping section that
describes, for advanced users, the I/O map for this board. To read a DI
value, look at the appropriate offset for the _STATE variable for the
board.