Product data

DeltaV Product Data Sheet
October 2014 – Page 22 S-Series Electronic Marshalling
Discrete Input NAMUR CHARM
Specifications for DI NAMUR CHARM
Sensor Types NAMUR Sensors, Dry Contacts, Dry contact with end
of line resistance
Detection level for On
> 2.1 mA (<4 kΩ)
Detection level for Off
< 1.2 mA (>9 kΩ)
Channel Impedance
1.5 KΩ (approximate)
Wetting Voltage 12 Volts (± 5%)
Fault Detection capable
NAMUR Sensors or field resistor pack
• Guaranteed short circuit: <100 Ω
• Guaranteed good status: 400 Ω to 40 kΩ
• Guaranteed open circuit: > 75 kΩ
Configurable channel types:
• Discrete input
• Pulse Count
Dry contact or discrete state sensor changing <2 Hz
Pulse train 0.1 Hz to 10 KHz, 50 µsec min pulse width
Field Circuit Protection - 8 mA Current Limiting Circuit
- Field wiring disconnect
CHARM power req. 28 mA max @ 24 VDC
CHARM Heat Dissipation 0.51 W
Simplified Circuit and Connection Diagram for DI NAMUR CHARM