Metso D201466 DII8P24 8-Channel Digital Input Module

Description

Key Technical Specifications

The published M120 technical documentation specifies D201466 as the DII8P24 variant and distinguishes it from the 48 VDC DII8P48/D201467. The same documentation gives the electrical and timing values listed above.

Product Introduction

Metso Automation D201466, designated DII8P24, is an 8-channel digital input unit for the ACN I/O M120 platform. It accepts 24 VDC field signals and supports configurable pulse-counting operation, making it suitable for discrete status monitoring and pulse-based field applications.

The key replacement issue is matching the field-voltage version. D201466 is the 18–32 VDC DII8P24 variant; D201467 is the corresponding 40–58 VDC DII8P48 version. Do not substitute them solely because their channel counts are identical.

Installation & Configuration Guide

Stage 1: Pre-Installation Preparation

Estimated time: 5–10 minutes

⚠️ Safety First: Notify operations, place the controlled process in a safe state, and apply the site’s lockout/tagout procedure before removing the I/O unit.

Tools Required:

• ESD wrist strap
• Small Phillips screwdriver if required by the mounting assembly
• Digital multimeter
• Wire labels
• Smartphone or camera for configuration records

Data Backup:

1. Record the existing I/O unit’s exact designation: D201466 / DII8P24.
2. Photograph the existing wiring before disconnection.
3. Record the mounting-base and cable arrangement.
4. Photograph the address setting on rotary switch S1.
5. Confirm that the field supply is appropriate for the 24 VDC version.
6. Keep the removed unit available for comparison until commissioning is complete.

⚠️ Do not assume that a visually similar Metso I/O unit is electrically interchangeable. D201466 is specifically the DII8P24 version, while D201467 is the 48 VDC DII8P48 variant.

Stage 2: Removing the Old Module

Estimated time: 5 minutes

1. Confirm that the I/O group is de-energized according to the site’s maintenance procedure.
2. Identify the position in the M120 mounting assembly.
3. Label each field connection before disconnecting it.
4. Disconnect the field wiring without pulling on the conductors.
5. Release the module from its mounting base.
6. Pull the unit straight out rather than twisting it against the connector.
7. Inspect the connector and mounting base for contamination, bent contacts, or mechanical damage.

The is used with M120 mounting-base arrangements and associated cross-connection cabling. Metso training documentation specifically lists among the I/O units supported by the S446448 cable hood set.

⚠️ Keep the old module until the replacement has passed functional testing. Its switch position and wiring arrangement are useful references if the commissioning results are unexpected.

Stage 3: Installing the New Module

Estimated time: 5–10 minutes

1. Verify the replacement marking: / DII8P24.
2. Put on the grounded ESD wrist strap before handling the PCB or module.
3. Compare the replacement module with the removed unit.
4. Set the address rotary switch S1 to match the documented original configuration.
5. Confirm that the mounting base and connector arrangement correspond to the M120 installation.
6. Insert the module carefully into the mounting position.
7. Ensure that the module is fully seated.
8. Reconnect the field wiring according to the photographs and wiring documentation.
9. Check that each conductor is mechanically secure.

Self-Checklist:

• / confirmed
• S1 address confirmed
• 24 VDC field supply confirmed
• Wiring matches original documentation
• Module fully seated
• No loose conductors
• ESD precautions followed

Stage 4: Power-On & Testing

Estimated time: 10–15 minutes

1. Before energizing, use a multimeter to check the field supply and verify that no obvious short circuit exists.
2. Energize the I/O group according to the plant commissioning procedure.
3. Check the control system for I/O communication or module diagnostics.
4. Verify that the is recognized at the expected I/O address.
5. Apply a known 24 VDC input signal to each channel in a controlled test.
6. Confirm that each corresponding input changes state correctly.
7. If pulse-counting functionality is used, test it with a known pulse source within the module’s specified operating range.
8. Verify all eight channels before returning the process to automatic operation.

⚠️ Do not test as though it were the 48 VDC D201467. The documented field-voltage ranges are different: operates with 18–32 VDC field voltage, while D201467 is specified for 40–58 VDC.

D201466

D201466

Frequently Asked Questions (FAQ)

Can be used as a 48 VDC digital input module?

No. is the version, specified for an 18–32 VDC field supply. The 48 VDC version is D201467 / DII8P48. The two should not be treated as interchangeable simply because both provide eight digital input channels.

How many digital inputs does the provide?

provides 8 digital input channels. The Metso documentation identifies it as the unit.

What is the input voltage range of ?

The documented field-voltage range is 18–32 VDC, with 24 VDC as the nominal application voltage. The input impedance is specified as 3.5 kΩ.

Can perform pulse counting?

Yes. The technical documentation specifies a pulse-counting mode below 400 Hz, with a parameterizable shortest pulse length of 1 ms and pulse hold time from 0 to 1,250 ms.

Is obsolete?

The available documentation identifies as an ACN I/O component, but the sources reviewed here do not establish its current OEM lifecycle status. For a replacement purchase, verify current OEM support and the exact revision required by the installed system.

What should I verify before ordering a replacement ?

At minimum, verify , the eight-channel digital-input configuration, 24 VDC field application, mounting-base compatibility, and the required hardware revision. If your existing unit is marked , do not order without confirming the field-voltage requirement.

Will replacing erase the PLC/DCS configuration?

The I/O unit itself is not the same type of device as a standalone PLC CPU containing the complete control program. However, the replacement must match the configured I/O address and system hardware configuration. Record the existing S1 setting and verify the I/O configuration after installation. The documentation identifies S1 as the address-selection switch for I/O units mounted on the base.