Omron SYSMAC C Series Operation Manual page 105

Functions
1, 2, 3...
Input Range: 0 to 20mA
Scaling High: 1,200 PSI
Scaling Low: 75 PSI
BCD
A/D Data
4095
1200
0300
0075
0000
0 mA 4 mA
Input signal range
1, 2, 3...
90
Example 3: Scaling 4 to 20 mA to 300 to 1,200 PSI
Input point 12 of the Unit is connected to a 4 to 20 mA signal from a pressure
sensor in pipe. The range for input point 12 has been set to 0 to 20 mA. It has
been determined that a 4 mA reading on the sensor indicates a pressure of 300
psi, and a 20 mA reading on the sensor indicates a pressure of 1200 psi. Thus
the range of the sensor is (900 psi)/(16 mA), or 56.25 psi/mA. If the sensor could
report a reading of 0 mA, the pressure would be 300 * (56.25
To configure the Unit to report the data in percentage full:
1. Set the scaling low and high limits to 75 and 1200.
2. Turn ON the scaling enable bit for input point 12.
Binary
(Hex)
Scaling Data
A/D Data
Normal Data
0FFF
04B0
012C
004B
0000
20 mA
Unit memory map
location
40
49
119 to 150
To use the scaling function for each input point do the following:
1. Set the input point scaling low and input point scaling high values for each
input point.
2. Turn ON the scaling enable/disable bit for the input point.
0 mA 4 mA
Input signal range
Description
Scaling active flags
Scaling enable bits
Scaling low and high
limits
Section 5-6
4), or 75 psi.
Scaling Data
Normal Data
20 mA
Valid data
0 or 1
0 or 1
BCD or 2's Complement
Binary