Pulse Inputs; Pi Wiring - Emerson FB1200 Instruction Manual

3.5

Pulse Inputs

The FB1200 flow computer 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 3-5: Pulse Input Characteristics
Type
Pulse
Input (PI)
3.5.1

PI Wiring

The diagrams below show how to wire the pulse inputs.
Figure 3-18: Pulse Input (PI) Wiring - (Base I/O - when optional I/O also present)
Note: Pulse input wiring for PIDIDO shown. PIDIDO1 and PIDIDO2 share same GND terminal.
I/O Configuration and Wiring
Number Supported
0 to 6 as follows:

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.

1 to 4 additional non-isolated channels on
optional 6-channel expansion I/O board
(PI/DI/DO3 through PI/DI/DO6). If present
you can con- figure one, two, three, four or
none as PIs.
Emerson FB1200 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
D301782X012
July 2017
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