Emerson FB1200 - Pulse Inputs

Emerson FB1200 Flow Computer Instruction Manual
D301782X012
March 2019
I/O Configuration and Wiring 67
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
Number Supported
Characteristics
Pulse
Input
(PI)
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.
▪
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
3.5.1 PI Wiring
The following diagrams show how to wire the pulse inputs.
Note
Figure 3-18 shows pulse input wiring for PIDIDO1. PIDIDO1 and PIDIDO2 share the same GND
terminal.