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Key Technical Specifications
- Manufacturer: Gespac
- Model: GESOUT-3 OUT-3B
- Product Type: Industrial digital output board
- Output Channels: 32
- Channel Organization: Four groups of eight outputs
- Output Circuit: Open-collector transistor
- Output Current: Up to 100 mA per channel, according to available product records
- Output Voltage: Configuration-dependent; 12 V, 24 V, or 48 V versions are reported
- Protection: Verify whether the exact revision includes channel or group-level protection
- Backplane Interface: Gespac system-specific interface; verify rack compatibility
- Field Connector: Verify connector type and pin assignment from the board drawing
- Logic Polarity: Verify active-low/open-collector behavior before wiring
- Load Type: External DC loads such as relays, lamps, solenoids, or interface circuits
- Isolation: Verify channel-to-channel and field-to-logic isolation for the exact board
- Operating Temperature: Verify from the original Gespac documentation
- Board Dimensions: Verify against the installed rack and card guide
- Revision: OUT-3B; confirm PCB revision and label suffix
- Status: Legacy/obsolete spare part; confirm current availability
Available industrial listings identify the GESOUT-3 OUT-3B as a 32-channel digital output card with four 8-channel groups and open-collector transistor outputs. They report a 100 mA output capability and multiple voltage configurations, but do not provide a sufficiently complete primary datasheet for installation approval.
Some reseller pages incorrectly describe this part as an analog I/O, controller, or mixed-signal module and publish conflicting channel counts and voltage values. Confirm the actual board label, output voltage variant, connector pinout, and rack family before purchase.
Product Introduction
The Gespac GESOUT-3 OUT-3B is a legacy digital output board used to switch external DC loads through open-collector transistor outputs. The available records identify 32 channels arranged as four groups of eight, with approximately 100 mA output capability per channel.
This card is configuration-sensitive. The exact output-voltage version, field connector, active polarity, common arrangement, rack interface, and load protection must match the existing system. Treat the seller’s listing as preliminary identification until the board label and wiring documentation are verified.
GESOUT-3 OUT-3B
GESOUT-3 OUT-3B
Troubleshooting Quick Reference
| Symptom | Possible Cause | Relevance to This Part | Quick Check Method | Recommendation |
|---|---|---|---|---|
| All outputs remain off | Missing board supply, rack power failure, or backplane communication fault | ✅ High | Measure the board supply at the rack connector and check adjacent card status indicators | Check rack power and controller communication before replacing the output card |
| One output remains off | Open transistor, broken field wire, missing load supply, or incorrect logic polarity | ✅ High | Command the channel and measure voltage at the field terminal and load side | Check the field circuit and load supply before condemning the channel |
| One output remains on | Shorted transistor, backfeed through the load, or controller logic fault | ✅ High | Remove the command and measure the output; isolate the load if safe | Replace the board only after ruling out external backfeed and wiring faults |
| Entire 8-channel group fails | Shared group supply, common return, fuse, or group driver fault | ✅ High | Measure the group common and load supply under command; compare with a working group | Inspect shared wiring and fusing before replacing the card |
| Outputs operate at the wrong voltage | Incorrect board variant or field supply connected to the wrong common | ✅ High | Measure the installed board’s supply and compare the label with the original voltage configuration | Do not connect a 12 V, 24 V, or 48 V load until the board variant is confirmed |
| PLC commands change but loads do not energize | Open-collector output needs an external load supply or return path | ✅ High | Verify the load circuit has the required external DC supply and common return | Wire the output as a sinking transistor circuit; do not expect it to source voltage |
| Output fuse or supply trips | Shorted field load, incorrect polarity, or excessive inrush current | ✅ Medium | Disconnect loads one at a time and measure load resistance and inrush current | Correct the external load fault before installing another card |
| Several unrelated channels fail | Rack supply, common return, backplane connector, or controller mapping issue | ❌ Low to ✅ Medium | Compare failures by output group and inspect connector seating and terminal voltage | Investigate rack-level causes before replacing the GESOUT-3 |
| Output indication differs from actual load state | LED logic does not confirm transistor conduction or field wiring is open | ✅ Medium | Measure directly at the output terminal while commanding the channel | Use a meter at the terminal; do not rely solely on board LEDs |
| Replacement card fails immediately | Wrong voltage variant, incorrect connector orientation, or pinout mismatch | ✅ High | Compare board markings, connector keys, terminal labels, and wiring photos | Stop power-up and verify the complete card configuration before retrying |
Critical warning: An open-collector output normally sinks current and requires an external load supply. Do not assume that the output terminal sources 12 V, 24 V, or 48 V. Confirm the exact board variant and terminal common arrangement before applying field power. Contact technical support with board photos, connector pinout, rack type, measured supply voltage, failed channel numbers, and diagnostic logs if the fault remains unresolved.
Frequently Asked Questions
What is the GESOUT-3 OUT-3B?
It is a legacy Gespac digital output board. Available records describe 32 open-collector transistor outputs arranged in four groups of eight, intended for switching external DC loads.
Is it a 32-channel or analog I/O module?
The strongest available identification describes it as a 32-channel digital output board. Several reseller pages incorrectly call it an analog or mixed I/O module, so verify the PCB markings, terminal labels, and schematic before ordering.
What output voltage does it use?
Available industrial records mention 12 V, 24 V, and 48 V configurations. That does not mean one card supports all three voltages. The exact voltage is configuration-specific and must be confirmed from the board label, schematic, or original Gespac documentation.
Can it directly drive a solenoid or relay?
Only if the load current, voltage, suppression requirements, and output wiring match the board specification. Open-collector outputs typically sink current rather than source it. Check the load’s coil current and install the required flyback suppression before testing.
Is the OUT-3B a direct replacement for another GESOUT card?
Do not assume compatibility from the GESOUT family name. Compare the rack interface, connector pinout, channel count, group commons, output polarity, voltage variant, and controller addressing. A similar-looking card can damage the field circuit or produce incorrect machine behavior.
What should I photograph before removing the original card?
Photograph the complete front and rear of the board, model label, revision markings, connector keys, terminal wiring, rack slot, and any jumpers or configuration links. Record the external load voltage and the failed channel numbers.
What condition is the available unit?
The listing should clearly state New Original, New Surplus, or Refurbished and tested. For a refurbished GESOUT-3 , request a powered rack test, channel-by-channel output test, insulation or leakage checks where applicable, connector photographs, and a written warranty.
