Product Overview

The Emerson IC694MDL940 is a discrete relay output module from the PACSystem RX3i series. GE Intelligent Platforms originally manufactured this module. Emerson Automation now continues the RX3i product line. This module features sixteen Normally Open (N.O.) contacts as Form A relays. The outputs divide into four groups of four channels each. Each contact operates with either 5-30 VDC or 5-250 VAC at 47 to 63 Hz. Nominal voltages include 24 VDC for DC operation and 120/240 VAC for AC operation. Each channel handles maximum loads of 2 Amps pilot duty. Total current per common reaches 4 Amps maximum. The IC694MDL940 draws 7 mA from the 5V backplane when all outputs energize. Additionally, it draws 135 mA from the relay 24V bus on the backplane. Thirty-two individually-numbered LEDs indicate the status of each output channel. The product lifecycle status remains active for this module.

Technical Specifications

General Specifications

Output Specifications

Isolation Specifications

Power Specifications

Physical Specifications

Sixteen Normally Open Relay Outputs

The IC694MDL940 provides sixteen individually isolated Normally Open relay contacts. Form A contacts (N.O.) close when the output energizes and open when de-energized. Each output operates independently with point-to-point isolation. This design prevents cross-talk between adjacent channels. Typical loads include motor starters, solenoids, and indicators. Consequently, the Emerson IC694MDL940 suits a wide range of AC and DC switching applications.

Four Groups of Four Channels

The sixteen outputs divide into four groups of four channels each. Each group has its own common output terminal. However, groups are non-isolated from each other according to the specifications. Total current per common reaches 4 Amps maximum. For AC and DC mixing, different groups can operate at different voltages. For example, group one could switch 120 VAC while group two switches 24 VDC. Therefore, the IC694MDL940 provides flexibility for mixed voltage applications.

Output Voltage & Current Ratings

Operating voltage spans 5 to 30 VDC for DC applications. For AC applications, voltage spans 5 to 250 VAC at 50/60 Hz. Nominal DC voltage is 24 VDC for standard industrial control. Nominal AC voltages are 120/240 VAC for line-powered devices. Each output handles 2 Amps maximum pilot duty. Inrush rating reaches 5.0 Amps for inductive loads. Minimum load requirement is 10 mA for reliable contact wetting. Output voltage drop depends on the external load and wiring. For robust field control, the Emerson IC694MDL940 handles diverse load types.

Response Time & Contact Life

Response time reaches 15 ms maximum for both ON and OFF transitions. This speed suits most industrial control applications adequately. Relay contact life varies from 100,000 to 1,000,000 operations. Actual contact life depends on voltage level and load type. Resistive loads extend contact life significantly. Inductive loads reduce contact life due to arcing. Therefore, consider using external suppression for inductive loads with the IC694MDL940.

No Internal Fusing

This module does not come with an internally installed fuse for channel protection. External fuses may be installed to protect the module and field devices. For each output channel or common, add appropriate fuses based on load current. This approach allows customized protection levels for different applications. Consequently, the IC694MDL940 offers design flexibility for protection coordination.

LED Indicators

Thirty-two individually-numbered LEDs appear on the front panel of this module. Each of the sixteen output channels has two associated LEDs. An energized LED indicates an energized output channel. A de-energized LED indicates the opposite condition. For maintenance and troubleshooting, these LEDs prove invaluable. The Emerson IC694MDL940 reduces diagnostic time with clear visual feedback.

Isolation Ratings

Field to backplane isolation reaches 250 VAC continuous with optical technology. For one minute, isolation reaches 1500 VAC to frame ground. Channel to channel isolation also reaches 250 VAC continuous and 1500 VAC for one minute. This high isolation protects the backplane from field-side faults. For safety and noise immunity, the IC694MDL940 provides robust electrical separation.

Backplane Current Draw

Current draw from the 5V backplane reaches 7 mA when all outputs energize. Current draw from the relay 24V bus reaches 135 mA when all outputs energize. The relay 24V bus powers the internal relay coils. External field power must be supplied separately for output devices. For system power budgeting, the Emerson IC694MDL940 has moderate requirements.

Installation Guidelines

Follow these steps for proper installation of the IC694MDL940.

1. Power down the RX3i rack completely before handling any modules.

2. Select an empty I/O slot in the RX3i backplane for this module.

3. Align the module with the upper and lower card guides in the slot.

4. Slide the IC694MDL940 firmly into place until the connectors fully seat.

5. Secure the module using the retaining screws at top and bottom.

6. Connect field wiring to the output terminals. Each group has its own common.

7. Connect external AC or DC power to the common terminals for each group.

8. Install external fuses if additional protection is desired for each group or channel.

9. Power up the system and verify each LED responds correctly to output commands.

Note: The IC694MDL940 uses relay outputs with Normally Open contacts. External power for field devices must be supplied separately. The module draws relay coil power from the 24V backplane bus. Minimum load of 10 mA is required for reliable contact operation. Use external suppression for inductive loads to extend contact life.

Packaging List

• One Emerson IC694MDL940 Relay Output Module

• One product quick start guide

• One terminal connector set

• One anti-static protective bag

Common FAQs

1. What is the output voltage range of the IC694MDL940?

Operating voltage spans 5 to 30 VDC for DC applications. For AC applications, voltage spans 5 to 250 VAC at 50/60 Hz. Nominal DC voltage is 24 VDC. Nominal AC voltages are 120/240 VAC. For mixed voltage applications, the Emerson IC694MDL940 handles both AC and DC loads on different groups.

2. How many output groups does the IC694MDL940 have?

This module features four groups of four output channels each. Each group has its own common output terminal. Groups are non-isolated from each other. Total current per common reaches 4 Amps maximum. Therefore, the IC694MDL940 provides flexibility for distributing loads across four separate commons.

3. What is the response time of the IC694MDL940?

Response time reaches 15 ms maximum for both ON and OFF transitions. This speed suits most industrial control applications. Relay contact life varies from 100,000 to 1,000,000 operations. Actual life depends on voltage and load type. For longer contact life with the IC694MDL940, use external suppression for inductive loads.

4. Does the IC694MDL940 include internal fusing?

No, this module does not come with internally installed fuses for channel protection. External fuses may be installed to protect the module and field devices. For each output channel or common, add appropriate fuses based on load current. Consequently, the Emerson IC694MDL940 offers flexibility for protection coordination.

5. How much current does the IC694MDL940 draw from the backplane?

Current draw from the 5V backplane reaches 7 mA when all outputs energize. Current draw from the relay 24V bus reaches 135 mA when all outputs energize. The relay 24V bus powers the internal relay coils. For system power budgeting, the IC694MDL940 has moderate requirements leaving capacity for other modules.