Pulse Inputs; Pi Wiring; 3-5. Pulse Input Characteristics - Emerson FB2100 Instruction Manual

3.5

Pulse Inputs

The FB2100 flow computer with I/O option 2 includes two channels that can be
individually configured as either pulse inputs (PI), digital inputs (DI), or digital outputs
(DO).
When configured as pulse inputs, the PI channels have the following characteristics:
Table
Type
Pulse Input (PI)
3.5.1

PI Wiring

The diagram below shows how to wire the pulse inputs.
I/O Configuration and Wiring

3-5. Pulse Input Characteristics

Number Supported
0 to 2 as follows (I/O option 2
only):
 1 or 2 non-isolated channels
on CPU board (PI/DI/DO1 and
PI/DI/DO2). Two always
present; you can configure
one, both, or neither as PIs.
FB2100 Flow Computer Instruction Manual
Characteristics
 Supports dry contacts and
open collector outputs
connected to ground and
voltage inputs
 Supports single pulse for
volume or mass
 Input filtering selectable at 30
µs or 1 ms
 Frequency range from 0 to10.5
KHz
 Maximum input frequency for
the 1 ms filter is 300 Hz
 When a channel is configured
as a PI it cannot be used as a
DI or DO channel
 ON when greater than 3.0V;
OFF when less than 2.0V
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