Emerson Process Management Bristol ControlWave ExpressPAC - Manual (Page 56)

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.