KROHNE OPTISENS MAC 080 EN - Manual (Page 22)

4
ELECTRICAL CONNECTIONS
22
OPTISENS MAC 080
www.krohne.com 01/2010 - MA MAC 080 R02 en
4.3.2 Digital inputs
The three digital inputs are using the converter’s internal 24 VDC. To use an external 24 VDC
source, galvanic isolated from the rest of the system (e.g. from a DCS or control system), the
inputs need to be jumpered. These inputs can be used for selecting calibration for sensors
having more than one calibration curve by setting up the sensor to use an external calibration.
To connect a sensor using a multiple point calibration (setup external calibration) the digital
outputs are used to select calibration of the sensor.
No active input will result in calibration curve "A". If input 1 is activated calibration curve "B" will
be used, if input 2 is activated calibration curve "C" will be used, and finally if input 3 is activated
calibration curve "D" will be used. The higher the number of the input the more dominant it is, in
other words if input 3 is active calibration curve "D" will be used regardless of the state of the
other inputs.
Digital inputs Position JP2
Active, internal 24 VDC (default) 1-2
Passive, external 24 VDC 2-3
Figure 4-5: Active digital input
1 External switch passive
2 Converter terminal 1, 2 or 3
3 Converter active internal 24 VDC
4 Converter terminal 5
.book Page 22 Tuesday, January 19, 2010 1:07 PM