Emerson FB1200 - Digital Inputs

Emerson FB1200 Flow Computer Instruction Manual
D301782X012
March 2019
I/O Configuration and Wiring 61
Note
Figure 3-11 shows analog output wiring for AIAO4. AIAO3 and AIAO4 share the same GND terminal.
Figure 3-11:
AO Wiring (with Optional 6-channel Expansion I/O Module)
1
Field Device
3.3 Digital Inputs
Depending upon how you ordered it, the 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
Number Supported
Characteristics
Digital
Input
(DI)
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.
▪
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