Key Technical Specifications

• Product Type: Discrete Output Module
• Output Voltage Range: 20 to 60 VDC
• Nominal Voltage: 24/48 VDC
• Output Current: 0.5 Amps per point (Max 2.0 Amps per group)
• Output Points: 32 points, configured as four isolated groups of 8
• Logic Type: Positive Logic (Sourcing)
• On-State Response Time: 1 ms typical
• Off-State Response Time: 1 ms typical
• Leakage Current: 1 mA maximum at 60 VDC
• Isolation (Point to Rack): 1500 V RMS
• Isolation (Point to Point): 500 V RMS
• Fuse Protection: User-replaceable, 2 Amp per group

 

Product Introduction

I’ve pulled more of these out of dusty Series 90-70 racks in paper mills than I can count. The IC697MDL750 is a 32-point discrete output module that handles 24/48VDC loads, and it does its job without complaining. It switches relays, solenoids, and stack lights using positive logic (sourcing). When you need to turn something on in a legacy GE system, this is usually the card sitting in the slot.Engineers stick with this specific module because it gives you 32 points in a single slot, and the four isolated groups of 8 points actually matter when you’re mixing different load voltages in one rack. Each point handles 0.5A, and each group handles 2A max. It’s not a high-power beast, but it’s predictable. Just be warned: this revision is notoriously sensitive to inductive kickback from unshielded solenoid coils, so always use snubbers or flyback diodes if you want it to survive past the warranty period.

Quality SOP & Tech Pitfalls

We don’t just wipe the dust off and ship these. Every IC697MDL750 goes through a brutal pre-shipment protocol. First, we do a visual and counterfeit check under magnification to ensure the GE logos and date codes aren’t laser-etched fakes. Next, it goes on a live Series 90-70 test rack where we toggle all 32 points and measure the actual voltage drop across the MOSFETs. We use a Fluke 115 to verify isolation resistance between groups and check for any internal leakage. Finally, we log the firmware/hardware revision and seal it in anti-static packaging.Here is the reality check: The most common mistake I see is swapping this card without checking the group fuses. If your old card had a blown 2A fuse on Group 3 because a solenoid shorted out, putting in a brand new IC697MDL750 won’t fix the problem. The new card will immediately blow its fuse or go into fault. I once watched a tech spend three hours swapping three brand-new cards, thinking they were all defective, before realizing he had a dead short in the field wiring. Always check your field wiring and fuses first.

 

Installation & Configuration Guide

1. Pre-Installation: ⚠️ SAFETY FIRST. Power down the Series 90-70 rack and wait 60 seconds for the capacitors to discharge. Take a high-resolution photo of the old card’s wiring AND the DIP switches/jumpers. Verify the field 24/48VDC supply is actually within the 20-60VDC range before proceeding.
2. Removal: Label every single wire with a sharpie or tape. Do not trust your memory. Release the top and bottom DIN clips, and pull the card straight out. Never pry it with a screwdriver, or you will crack the backplane connector.
3. Installation: Copy the DIP switch/jumper settings exactly. This prevents 90% of startup failures. Slide the new IC697MDL750 into the slot, ensuring it seats flush against the backplane. Reconnect the wiring exactly as photographed.
4. Power-On & Testing: Apply rack power. Watch the module LEDs. The ‘OK’ LED should be solid green. If it flashes or stays off, you have a backplane communication issue or a bad slot. Force the outputs on via your programming software and verify 24/48VDC at the terminal block.

 

Compatible Replacement Models

• ✅ IC697MDL750RR: Drop-in replacement. The ‘RR’ suffix typically denotes a revised manufacturing run or RoHS compliance. Pinout, logic, and specs are identical.
• ⚠️ IC697MDL751: Software compatible but hardware different. This is a 32-point 5VDC only module. Do NOT use this for 24/48VDC applications. Requires logic recompile if changing voltage domains.
• ❌ IC697MDL740: Hardware mod required. This is a 24/48VDC module but with 2A per point and different isolation. Requires rewiring and chassis evaluation. Advise against unless doing a full system upgrade.

Frequently Asked Questions (FAQ)

Can I hot-swap the IC697MDL750 while the rack is powered?
No. The Series 90-70 backplane is not designed for hot-swapping discrete I/O cards. If you pull this card while energized, you risk arcing across the backplane pins and frying the CPU. Always power down.Is this module sourcing or sinking?
It is sourcing (positive logic). The module provides the positive voltage to the load, and the load returns to the common. If your field devices require sinking (negative logic), you need the IC697MDL740 or similar. Check your wiring diagrams before ordering.My new card’s OK LED is off. Is it dead?
Not necessarily. First, verify the rack power supply is outputting stable 5VDC to the backplane. Second, make sure the card is fully seated. I’ve seen cards that looked seated but were 2mm off the backplane connector. Reseat it firmly. If the LED still doesn’t come on, try a different slot to rule out a dead backplane channel.Can I use this card to drive a 12VDC solenoid?
Technically yes, since the range is 20-60VDC… wait, no. 12VDC is below the 20VDC minimum. The MOSFETs won’t turn on properly, and you’ll get erratic behavior or no output at all. Stick to 24VDC or 48VDC loads.How do I know if a group fuse is blown?
If an entire group of 8 points stops working but the other groups are fine, and the OK LED is still on, you likely blew the internal 2A group fuse. You can verify this with a multimeter by checking continuity across the fuse test points (refer to the GFK-0467 manual for exact locations). If it’s open, the card is trash unless you’re comfortable doing SMD soldering.Are these new or refurbished?
We sell both, and we are transparent about it. “New Original” means factory-sealed, never installed. “New Surplus” means it was pulled from a cancelled project but never used in the field. Both are tested on a live rack and carry the same 1-year warranty. Always check the product listing before checkout.