DI 8-channel NAMUR card specifications

Installation notes

The 8-channel terminal block is recommended to provide terminations for field wiring for the DI 8-channel NAMUR card. Optional terminal blocks are the Fused 8-channel terminal block and the 16-pin mass terminal block.
The Redundant discrete 8-channel terminal block is recommended to provide terminations for field wiring for the redundant DI 8-channel NAMUR card.
NAMUR sensors that are designed to operate within an excitation voltage range of 5 to 18 V are compatible with DI 8-channel NAMUR cards. With 24 VDC power connected to this card there is enough wetting current and excitation voltage (15.6 VDC ) 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 DI 8-channel NAMUR cards. 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.
This card requires an S-series controller.
The DI 8-channel NAMUR 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 KΩ resistor in series (allows short circuit detection).

Figure: External line fault detection resistors

Table: Line fault detection levels
Line fault detection enabled	Value detected
Short Circuit	<100 Ω for guaranteed short circuit detection
Open Circuit	>100 kΩ for guaranteed open loop detection

Specifications

Table: DI 8-channel NAMUR card specifications
Item	Specification
Number of channels	Eight
Channel voltage	15.6 VDC
Detection level for On	> 2.2 mA
Detection level for Off	< 1 mA
Impedance	5 kΩ
LocalBus current (12 VDC nominal), per card	Simplex: 75 mA typical 100 mA maximum Redundant: 90 mA typical 150 mA maximum
Field circuit power, per card	100 mA at 24 VDC (±10%)
Isolation	Each channel is optically isolated from the system and factory tested to 1500 VDC.
Heat dissipation	3.3 W for simplex and redundant
Optional fuse (Simplex mode only)	2.0 A
Mounting	Assigned slot of I/O carrier

Wiring diagrams

Figure: Simplex DI 8-channel NAMUR card wiring diagram

Figure: Redundant DI 8-channel NAMUR card wiring diagram