Pulse Inputs; Pi Wiring - Emerson FB1200 Instruction Manual

3.5

Pulse Inputs

The flow computer includes two channels that can be individually configured as 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 following diagrams show how to wire the pulse inputs.
Note
Figure 3-18
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.
shows pulse input wiring for PIDIDO1. PIDIDO1 and PIDIDO2 share the same GND
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
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March 2019
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