ABB NTDI01 Digital I/O Termination Unit Module

NTDI01 is a digital input terminal unit of the ABB Harmony series. It is used with IMDSI13, IMDSI14, and IMDSI22 digital input modules to connect field device lines with the system. It sets the power supply and signal paths through jumper configurations (XU1-XU17). The terminal blocks TB1-TB4 correspond to different input points and can access signals such as 120VAC, 24VDC, 48VDC, and 125VDC. During installation, it needs to be connected to the backplane of the module mounting unit. Cooperating with the digital input module, it transmits 16 channels of field signals to the Symphony system for the controller to monitor and control processes, and is compatible with the INFI 90 OPEN system.

DATA SHEET

NTDI01.pdf

Technical Specifications

1. Electrical Parameters

Digital Inputs: 16 channels, with different voltage ranges for different models (±10% tolerance)

Current Parameters: 5.5mA at 24VDC, 4.7mA at 48VDC, 4.5mA at 125VDC, 6mA at 120VAC

Switching Thresholds:

Turn-on Voltage (minimum): 19.5VDC (24VDC type), 26.7VDC (48VDC type), etc.

Turn-off Voltage (maximum): 13VDC (24/48VDC type), 55VDC (125VDC type), etc.

Response Time: 17ms for DC input (fixed debounce filtering)

2.Environmental Parameters

Operating Temperature: 0°C - 70°C (inside the cabinet)

Relative Humidity: 5% - 95% (below 55°C, non-condensing); 5% - 45% (at 70°C)

Barometric Pressure Range: Sea level to 3km

Anti-interference Performance: Compliant with multiple electromagnetic compatibility standards (IEC 61000 series, etc.)

1. Module Structure
   Core Components: Input isolation circuit (current limiter, optocoupler), threshold detection circuit, control logic, I/O expansion bus interface
   Connectors:
   P1: Logic power supply (+5VDC)
   P2: I/O expansion bus
   P3: Digital input signal
   Indicator Lights: 16 LEDs (8 in Group A and 8 in Group B) indicating input status
2. Working Process
   Field input signals are connected via P3 and pass through the input isolation circuit (1500VDC isolation)
   The threshold detection circuit judges the signal status (on/off)
   The control logic stores the signal status through point data bytes and status bytes
   The controller reads data through the I/O expansion bus (address set by S1 switch)
   V. Installation Process
3. Preliminary Preparation
   Anti-static Treatment: Use a dedicated anti-static kit (part number 1948385A1)
   Unpacking and Inspection: Confirm the packaging is intact and check for transportation damage
4. Configuration Settings
   Address Selection (S1 Switch): 6-position switch sets addresses 0-63, which must be consistent with the controller configuration (function code 84)
   Jumper Settings (IMDSI22 only):
   Operating Voltage Selection: Jumper positions corresponding to different voltages (Table 3-2)
   Mode Selection: AC/DC mode jumpers (Table 3-3)
5. Physical Installation
   Confirm the module installation slot and disconnect the power supply of the module mounting unit backplane
   Connect the terminal unit cable to the corresponding slot on the backplane
   Align the module with the guide rail and insert it, then tighten the front panel screws (half a turn to lock)
6. Wiring Instructions
   Power Supply and Bus: P1 (power supply) and P2 (bus) are automatically connected after the module is inserted
   Input Signals: Connect via NTDI01 terminal unit, refer to the pin definitions in Table 5-1
   VI. NTDI01 Terminal Unit Configuration
   Function: Connects field device wiring with digital input modules
   Jumper Configuration: Set power supply and signal paths through XU1-XU17 jumpers (Table A-1)
   Terminal Assignment: TB1-TB4 terminals correspond to different input points, refer to Figure A-2 for wiring

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