The DeltaV system supports the DI, 8-Channel, 24 VDC, Dry Contact card and the Series 2 DI, 8-Channel, 24 VDC, Dry Contact card (Simplex and Redundant modes).
Installation Notes
- The Fused I/O terminal block is recommended to provide screw terminations for field wiring for the DI, 8-Channel, 24 VDC, Dry Contact and the Series 2 DI, 8-Channel, 24 VDC, Dry Contact in Simplex mode. Optional terminal blocks are the I/O terminal block and the 16-pin mass termination block.
- The Redundant Discrete terminal block is recommended to provide screw terminations for field wiring for the Series 2 DI, 8-Channel, 24 VDC, Dry Contact card in Redundant mode.
- Compatibility with NAMUR Sensors — NAMUR sensors that are designed to operate within an excitation voltage range of 5 to 18 V are compatible with Series 2 DI, 8-channel, 24 VDC, Dry Contact cards. At 24 VDC, enough wetting current and excitation voltage is provided to operate NAMUR sensors designed for an excitation voltage range of 5 to 18 V. NAMUR sensors not designed to operate in the 5 to 18 V range may not work with Series 2 DI, 8-channel, 24 VDC, Dry Contact cards.
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Line Fault Detection — The Series 2 DI, 8-Channel, 24 VDC Dry
Contact card has line fault detection for detecting open or short circuits in
field wiring. To use this capability you must:
- Enable line fault detection in your configuration. Enable line fault detection on a channel-by-channel basis when you configure the channels.
- Connect the dry contact to external resistors. Connect the dry contact to a 6.8 KΩ resistor in parallel (allows the open circuit detection) and a 2.4 KW resistor in series (allows short circuit detection).
- Line Fault Detection in NAMUR Sensors — Line fault detection is built into NAMUR sensors. Do not use external resistors with NAMUR sensors; however, you must enable line fault detection in your configuration when using NAMUR sensors.
