Configured for 24 VDC discrete signal acquisition in CJ-series PLC systems, the Omron CJ1W-ID261 (CJ1W-ID261 DC Input Unit) provides 64 digital input channels through two 40-pin Fujitsu/OTAX-compatible connectors. The unit uses four 16-point common circuits, allocates 4 words, and accepts both NPN and PNP input devices when the same polarity is maintained within each common circuit. Omron specifies 4.1 mA typical input current and 90 mA maximum 5 VDC internal current consumption.

Technical Identifier Matrix

Omron's official specification lists the CJ1W-ID261 as a 64-point, 24 VDC input unit with Fujitsu/OTAX-compatible connectors and 4 allocated words.

Hardware Specifications

The CJ-series dimensional documentation identifies CJ1W-ID261 under the 64-point input units with two 40-pin Fujitsu/OTAX-compatible connectors. The CJ-series unit dimensions are 31 mm x 90 mm x 65 mm, corresponding to 3.1 cm x 9.0 cm x 6.5 cm.

Omron PLC I/O Architecture and Signal Handling

The CJ1W-ID261 is a high-density Basic I/O Unit for the Omron CJ-series controller architecture. Its 64 inputs are divided into four 16-point common groups. The unit occupies 4 CIO words in the PLC I/O allocation.

The 24 VDC input circuit uses a 5.6 kOhm input impedance and draws 4.1 mA typical per input at the rated voltage. The specified ON threshold is 19.0 VDC minimum, while the OFF threshold is 5 VDC maximum.

Omron specifies compatibility with both NPN and PNP output devices for its 24 VDC CJ-series input models. The same polarity must be used for devices connected to inputs sharing a common. A configurable digital filter from 0 to 32 ms is provided for suppression of unwanted external signal transitions.

The 50% simultaneous ON specification corresponds to 8 active input points within each 16-point common circuit at 24 VDC. This limitation should be considered when calculating field-device loading and input signal distribution.

Package Contents & Ordering Information

• 1x Omron CJ1W-ID261 DC Input Unit
• 1x CJ1W-ID261 64-point Basic I/O Unit
• 2x 40-pin Fujitsu / OTAX-compatible external connector interfaces
• External connector plugs are not included as standard accessories
• Terminal-block conversion hardware is available separately for compatible CJ-series I/O configurations

Omron lists the standard accessories for CJ1W-ID261 as none.

Field Installation Guidelines

• Install the CJ1W-ID261 in a compatible CJ-series PLC rack and verify the CPU and backplane configuration before energization.
• Confirm that the unit is assigned the required 4 words in the CJ I/O allocation.
• Supply field input circuits with 24 VDC within the specified 20.4 to 26.4 VDC range.
• Connect field devices through the two 40-pin Fujitsu/OTAX-compatible interfaces.
• Maintain the same NPN or PNP polarity for inputs belonging to the same common circuit.
• Do not exceed the specified simultaneous ON loading for each 16-point common group.
• Keep discrete signal wiring physically separated from high-current motor, contactor, inverter, and switching-power wiring where practical.
• Use appropriate cable shielding and grounding when the installation is exposed to significant electrical noise.
• Set the digital input filter according to the field signal characteristics. Increasing filtering can increase effective signal recognition delay.
• Verify input polarity and voltage before connecting field wiring to prevent incorrect signal interpretation.
• Check insulation and dielectric requirements when commissioning wiring connected to the external input circuits.
• Do not assume hot-swapping capability for the I/O unit unless the applicable CJ-series hardware documentation explicitly permits the operation.

Frequently Asked Questions

• Q: How many digital input channels does the CJ1W-ID261 provide?

  A: The CJ1W-ID261 provides 64 DC input channels. They are arranged as four 16-point common circuits and occupy 4 words in the CJ I/O allocation.

• Q: What voltage range is permitted for the inputs?

  A: The rated input voltage is 24 VDC, with a specified rated input voltage range of 20.4 to 26.4 VDC.

• Q: What connector does the CJ1W-ID261 use?

  A: The unit uses two 40-pin Fujitsu/OTAX-compatible connectors. Omron distinguishes this model from the CJ1W-ID262, which uses MIL connectors.

• Q: What are the physical dimensions of the module?

  A: The physical dimensions are 3.1 cm x 9.0 cm x 6.5 cm, corresponding to 31 mm x 90 mm x 65 mm in the CJ-series dimensional documentation.

• Q: What is the input impedance?

  A: The specified input impedance is 5.6 kOhm. At the rated 24 VDC input voltage, the typical input current is 4.1 mA.

• Q: What are the specified input response times?

  A: Both ON and OFF response times are specified at 8.0 ms maximum. The digital filter can be configured from 0 to 32 ms through the applicable CJ-series setup.

• Q: Can the CJ1W-ID261 accept both NPN and PNP sensors?

  A: Yes. Omron states that its 24 VDC input models can connect to devices with either NPN or PNP outputs. Devices sharing one common must use the same polarity.

• Q: What is the maximum internal current consumption?

  A: Omron specifies 90 mA maximum internal current consumption from the 5 VDC PLC supply. This corresponds to a maximum internal power demand of approximately 0.45 W.