Emerson FB2100 Flow Computer Instruction Manual
D301783X012
March 2019
64
I/O Configuration and Wiring
Table 3-3. Digital input Characteristics
Type
Number Supported
Characteristics
Digital
Input (DI)
0 to 2 as follows under CPU option 2 only:
▪
1 or 2 non-isolated channels on CPU
board (DI/DO/PI1 and DI/DO/PI2). Two
always present; you can configure one,
both, or neither 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
3.3.1
DI Wiring
The diagram below shows how to wire the digital input.
Figure 3-4. Digital Input (DI) Wiring [DI/DO/PI1 & DI/DO/PI2]
–
(CPU Option 2)
1
Dry contact
3.4
Digital Outputs
The FB2100 flow computer with CPU option 1 includes a single digital output. The FB2100 flow
computer with CPU option 2 includes two channels you can configure as digital outputs (DO),
digital inputs (DI) or pulse inputs (PI).
Note
When using a digital output to drive an inductive load (such as a relay coil), place a suppression
diode across the load. This protects the DO from the reverse Electro-Motive Force (EMF) spike
generated when the inductive load is switched off.
When configured as digital outputs, the channels have the following characteristics:
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