OptiFlex™ I/O Expanders (part no. FIO)
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21
2-10 Vdc
Engineering values associated with
2 Vdc (Min) and 10 Vdc (Max)
1
0-20 mA
Engineering values associated with
0 mA (Min) and 20 mA (Max)
1
N/A. The Analog Output microblock
will output the same value that
comes in to the microblock.
4-20 mA
Engineering values associated with
4 mA (Min) and 20 mA (Max)
1
Relay
N/A N/A
1
The Analog Output microblock uses the Min and Max values to linearly translate its incoming value into a
physical output signal (Volt or mA) sent from the FIO expander to an actuator. For example, set Min to 0 and Max
to 100 for an Analog Output microblock that receives a 0 to 100% open signal from a PID microblock and that
controls a 0–10 Vdc actuator so that when the PID signal is 100%, the FIO expander output is 10 Vdc. Similarly,
when the PID signal is 50%, the FIO expander output is 5 Vdc.
Resolution values
Resolution is not particular to a type of input or output, but the driver handles analog and binary inputs
and outputs differently. To set these values appropriately, you should understand how the driver uses
them.
Analog Input
(BAI)
The driver rounds the microblock's present value according to the resolution.
If the calculated present value is 13.789 and you set the
to
0.1, the control program uses 13.8 for any calculations downstream from the
microblock.
Analog Output
(BAO)
The driver rounds the wire input value to the microblock before performing any
scaling calculations.
If the wire input value is 13.789 and you set the
to 0.1, the
microblock uses 13.8 for any scaling calculations.