![background image](http://html.mh-extra.com/html/omron/cp1e-e-d-series/cp1e-e-d-series_user-manual_742511242.webp)
8 Using Expansion Units and Expansion I/O Units
8-74
CP1E CPU Unit Hardware User’s Manual(W479)
4 to 20 mA
The 4 to 20 mA range corresponds to the hexadecimal values 0000 to 2EE0 (0 to 12000). The entire
data range is FDA8 to 3138 (
−
600 to 12600). Inputs between 3.2 and 4 mA are expressed as two’s
complements. If the input falls below 3.2 mA, open-circuit detection will activate and converted data
will be 8000.
Open-circuit Detection Function for Temperature
If the circuit is disconnected, the open-circuit detection function will operate and the converted tem-
perature data will be set to 7FFF.
Open-circuit Detection Function for Analog Inputs
The open-circuit detection function is activated when the input range is set to 1 to 5 V and the volt-
age drops below 0.8 V, or when the input range is set to 4 to 20 mA and the current drops below 3.2
mA. When the open-circuit detection function is activated, the converted data will be set to 8,000.
The time for enabling or clearing the open-circuit detection function is the same as the time for con-
verting the data. If the input returns to the convertible range, the open-circuit detection is cleared
automatically and the output returns to the normal range.
Flow of Operation
1
•
Connect the Temperature Sensor Units to the CPU Unit.
2
•
Set the input type (temperature or analog input), the input thermo-
couple type (K or J) and the temperature unit (°C or °F).
3
•
Connect temperature sensors or analog devices.
4
•
Read converted data stored in the input words.
4 mA
20 mA 20.8 mA
3.2 mA
FDA8 (
−
600)
3138 (12600)
2EE0 (12000)
0000 (0)
0 mA
Converted Data
Hexadecimal (Decimal)
Set the temperature or
analog ranges.
Connect the temperature
sensors or analog devices.
Operation in the ladder
program.
Connect the Temperature
Sensor Units.
Summary of Contents for CP1E-E**D Series
Page 3: ......
Page 66: ...2 Basic System Configuration and Devices 2 22 CP1E CPU Unit Hardware User s Manual W479...
Page 318: ...Appendices A 54 CP1E CPU Unit Hardware User s Manual W479...
Page 322: ...Index 4 CP1E CPU Unit Hardware User s Manual W479...
Page 324: ...Revision 2 CP1E CPU Unit Hardware User s Manual W479...
Page 325: ......