Pulse Inputs (3Mix12/3Msg12); Pulse Input Characteristics - Emerson FB3000 Instruction Manual

FB3000 RTU Instruction Manual
D301851X012
November 2023
Figure 3-8
loop supply. The total current for all devices connected to a DO channel must not exceed
500 mA. For example, you could wire two devices in parallel, one with 200 mA, and
another with 300 mA. This figure shows a single device using 500 mA.
Figure 3--8. Digital Output (DO) Wiring – Contact Closure using 24V Loop Supply
1
3.1.5

Pulse Inputs (3MIX12/3MSG12)

The 12-channel mixed I/O module includes eight channels you can individually configure
as either analog inputs (AI), digital inputs (DI) or pulse inputs (PI).
When configured as pulse inputs, the PI channels have the following characteristics:
Table 3-6. Pulse Input Characteristics
Type
Pulse
Input (PI)
58
shows how to wire a digital output as a contact closure using the internal 24V
500 mA load max field device
Number
Supported
Any of AIDIPI_01
through
AIDIPI_08 can be
individually
configured as
pulse inputs.
Characteristics
When a channel is configured as a PI it cannot be

used as a DI or AI channel.
The range of pulse inputs must remain within the

span of 0VDC to 30VDC.
All pulse inputs have 1V hysteresis applied to

them; switching levels are 2VDC for rising signals
and 1VDC for falling signals.
I/O Configuration and Wiring