Digital Inputs; Di Wiring - Emerson FB1200 Instruction Manual

Emerson FB1200 Flow Computer Instruction Manual
D301782X012
July 2017
3.3

Digital Inputs

Depending upon how you ordered it, the FB1200 flow computer includes either two or six channels
you can individually configure as digital inputs (DI), digital outputs (DO), or pulse inputs (PI).
When configured as digital inputs, the channels have the following characteristics:
Table 3-3: Digital input Characteristics
Type
Digital
Input (DI)
3.3.1

DI Wiring

The diagrams below show how to wire digital inputs.
Figure 3-12:
Note: Digital input wiring for DIDO1 shown. DIDO1 and DIDO2 share same GND terminal.
58
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 DIs.

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 DIs.
Digital Input (DI) Wiring - (Base I/O -when optional I/O also present)
Characteristics

Circuit protection

30ms input filtering

Maximum input frequency of 10 Hz

Selectable current source of 66 μA or 2 mA

Either externally driven or internally driven
and pulled to ground by dry contact
closures or open collector devices

When a channel is configured as a DI it
cannot be used as a DO or PI channel
I/O Configuration and Wiring