Product data

DeltaV Product Data Sheet
October 2014 – Page 24 S-Series Electronic Marshalling
Discrete Input 24 VDC Isolated CHARM
Specifications for DI 24 VDC Isolated CHARM
Detection level for On
> 10 VDC
Detection level for Off
< 5 VDC
Wetting Current 6 mA @ 24 VDC
Input Impedance
4 KΩ (approximately)
Isolation Galvanically isolated and factory tested to 1000 VDC
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 - Recommend External Fuse at power source
- Field wiring disconnect
CHARM power req. 12 mA max @ 24 VDC
CHARM Heat Dissipation 0.32 W
Simplified Circuit and Connection Diagrams for DI 24 VDC Isolated CHARM
Simplified Circuit and Connection Diagrams for DI 24 VDC Isolated CHARM with 3-wire DI Fused Injected Power Terminal
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