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I/O Board Wiring, DIP Switches, and Expansion Modules

Learn how to verify Enbase I/O board DIP switches, output jumpers, board IDs, J1708 wiring, thermocouple polarity, and expansion module requirements.

Enbase I/O boards use DIP switches, jumpers, and board IDs to define how individual channels and expansion modules operate. Incorrect switch positions, duplicate board IDs, or wiring issues can cause incorrect readings, communication problems, or unexpected I/O behavior.

Before changing any wiring, DIP switch, jumper, or board ID, confirm the channel assignment and device requirements against the applicable panel drawings and installation documentation.

Before You Begin

I/O wiring and hardware configuration should only be performed by qualified personnel following the applicable panel installation and operations guide.

In hazardous locations, do not service or change the specified RTU-1003 switches, connectors, or I/O module jumpers while the equipment is energized. If you are unsure whether it is safe to make a change, stop and contact Detechtion Support.

Digital Input DIP Switches

Digital Input (DI) channels use DIP switches located on the I/O board beneath the green terminal blocks.

Set the switch based on the input configuration:

  • Down = NC (Normally Closed) — use for 2-wire configurations.
  • Up = NO (Normally Open) — use for 1-wire configurations.

Always confirm the channel assignment and expected wiring configuration before changing the switch position.

Analog Input DIP Switches

Analog Input (AI) channels also use DIP switches beneath the green terminal blocks.

Set the switch based on the signal type:

  • Down = Current — typically used for 4–20 mA transducers.
  • Up = Voltage — used for 0–5 V signals.

If an analog value is significantly over range, such as approximately 123% of full scale, verify that the channel is not set to Voltage when the connected transducer requires Current.

A wrong channel assignment or switch position is a common cause of incorrect analog readings.

Digital Output Jumpers

Digital Outputs 6, 7, and 8 use jumpers rather than DIP switches to select Normally Open or Normally Closed operation.

Use the jumper position required by the panel drawings:

  • Top two prongs = NC (Normally Closed).
  • Bottom two prongs = NO (Normally Open).

Setting the I/O Board ID

When more than one I/O board is installed, each board must have a unique board ID set with the board ID dial.

Power the board OFF before changing the board ID.

A duplicate or incorrect board ID can cause symptoms such as:

  • The board appears as Not Connected in Grid View.
  • A digital input repeatedly flickers between Faulted and Normal because the system is reading the same channel from two boards.

J1708 modules are an exception and can share an ID with other boards without creating the same board-ID conflict.

J1708 Wiring

For J1708 communication wiring, use the following polarity:

  • PINK → DATA B (+).
  • PURPLE → DATA A (-).

A direct connection to the Hub or I/O board is preferred over a DB25 connection with a 90-degree adapter because adapters can loosen under vibration.

If an I/O board shares the J1708 bus, software and hardware version compatibility may apply. Confirm the applicable compatibility guidance if communication issues occur.

Expansion Module Types

The Enbase Hub supports the following I/O expansion modules:

IO-1003 (Standard)

16 Analog Inputs (AI), 16 Digital Inputs (DI), 16 thermocouple inputs, 2 Analog Outputs (AO), and 8 Digital Outputs consisting of 5 FET outputs and 3 relay outputs. The source guidance describes the thermocouple inputs as supporting grounded or ungrounded configurations.

IO-1004 (Compact)

4 Analog Inputs, 4 Digital Inputs, 4 thermocouple inputs, 4 Analog Outputs, and 4 FET Digital Outputs. This module uses a smaller footprint.

IO-1005 (Standard, Grounded Thermocouple)

16 Analog Inputs, 16 Digital Inputs, 16 grounded thermocouple inputs, 2 Analog Outputs, and 8 Digital Outputs consisting of 5 FET outputs and 3 relay outputs.

Expansion Module Installation Rules

IO-1003, IO-1004, and IO-1005 modules can be used together in the same expansion chain.

Follow these installation rules:

  • Install expansion modules adjacent to the RTU-1003 or Enbase Hub so the DB25 connectors mate correctly.
  • Use no more than three expansion modules in one chain.
  • Horizontal DIN rail orientation is recommended.

Thermocouple Wiring

Verify the thermocouple type and module requirements before wiring a thermocouple input.

The source guidance specifies the following Type K polarity:

  • Red = negative (-).
  • Yellow = positive (+).

This polarity can be easy to reverse, so confirm the terminal markings before connecting the thermocouple.

The source material also distinguishes the IO-1005 as the grounded-thermocouple version. Confirm the applicable module and panel documentation before connecting a grounded or ungrounded thermocouple.

Hazardous Location Restrictions

The installation guidance identifies specific switches, connectors, and jumpers that must not be serviced in a hazardous location while energized.

Do not touch or service the following in a hazardous location unless the equipment has been made safe in accordance with the applicable installation guide:

  • RTU-1003 SW1 or SW2.
  • RTU-1003 J900, J901, JP200, or J300 (USB).
  • IO-1003, IO-1004, or IO-1005 JP300, JP301, JP302, or JTAG jumpers.

Troubleshooting Common Symptoms

If the I/O board or connected device is not behaving as expected, verify the hardware configuration before replacing components.

  • Board shows Not Connected in Grid View → verify the board ID, power, physical connection, and that each I/O board has a unique ID.
  • Digital input flickers between Faulted and Normal → check for duplicate board IDs and verify the channel is being read from only one board.
  • Analog value is significantly over range → verify the AI DIP switch is set for the correct Current or Voltage signal type.
  • Digital output does not operate as expected → verify the DO 6, 7, or 8 jumper position and the panel drawing.
  • J1708 device does not communicate → verify PINK to DATA B (+), PURPLE to DATA A (-), board/bus connections, and applicable hardware/software compatibility.
  • Thermocouple reading is incorrect → verify the module type, Type K polarity, terminal assignment, and whether the application requires grounded or ungrounded thermocouples.

When Should I Contact Support?

Contact Detechtion Support if the board remains unavailable, readings remain incorrect after the documented wiring and switch settings are verified, outputs do not operate correctly, or you are unsure whether a hardware configuration change is safe or appropriate.