Discrete output channel specifications

Installation notes

When driving inductive loads greater than or equal to 0.8 Henry in simplex or 0.3 Henry in redundant, an RC compensator may be required. Size the RC compensator at 3.3 kΩ and 0.47 µf for simplex and 2.7 kΩ and 0.22 µf for redundant. Emerson's R-C Compensator module (KJ2231X1-ED1) provides this function. This module can be used for simplex and redundant applications.

Important

The R-C Compensator should not be used with LS DO CHARMs.

Pulse testing is recommended; however, it can be disabled for field devices such as solid state relays or active electronics that cannot support it. With redundant Logic Solvers, pulse testing requires partner synchronization and stops if the redundant partner becomes unavailable.

Line fault detection is not compatible with significant capacitive loading (cable + load > 30 nF) and must be disabled under these conditions.

Specifications

Table: Discrete Output Channel Specifications
Item	Specification
Number of channels	16
Isolation	Each channel is optically isolated from the system and factory tested to 1500 VDC. No channel-to-channel isolation.
Output voltage	Field power minus 2 V
Field power	0.5 A continuous per channel; 4.0 A max. per card
Output loading	56 to 3500 Ω
Off-state leakage	Open loop test off: 4.5 µA typical; 10 µA max. Note Optional pulse test will apply 24 VDC pulse on line for 1.0 mS every 50 mS. Refer to the Installation notes for more information on pulse testing.
Short circuit protection	Outputs current limited to 2.0 A typical
Line fault detection - short circuit	< 5 Ω for > 1 second with +24 VDC field power. Refer to the Installation notes for information on pulse testing.
Line fault detection - open circuit (with +24 VDC field power)	>25 kΩ for guaranteed open loop detection < 3.5 kΩ for guaranteed no open loop detection Refer to the Installation notes for information on pulse testing.

Wiring Diagram

Figure: Wiring diagram and terminations for Discrete Output channels