Overview
The ABB CI521-MODTCP, identified by the base model CI521-MODTCP, provides mixed-signal remote I/O over a Modbus TCP Ethernet connection. It integrates four analog inputs, two analog outputs, eight digital inputs and eight transistor outputs. The interface uses dual RJ45 sockets with an internal Ethernet switch for network connection and process data exchange.
Hardware Specifications
| Parameter | Specification |
|---|---|
| Model | CI521-MODTCP |
| Order Number | 1SAP222100R0001 |
| Brand | ABB |
| Product Type | Modbus TCP I/O Interface |
| Power Consumption | Maximum internal dissipation: 6 W |
| Ethernet Interface | 10/100 Base-TX |
| Ethernet Connectors | 2 x RJ45 |
| Integrated Analog Inputs | 4 channels |
| Integrated Analog Outputs | 2 channels |
| Integrated Digital Inputs | 8 channels |
| Integrated Digital Outputs | 8 transistor channels |
| Process Data Input | 20 bytes |
| Process Data Output | 24 bytes |
| Process Supply | 24 V DC at UP and UP3 |
| Supply Voltage Tolerance | -15% / +20% |
| Normal UP Current | 0.20 A |
| UP3 Current Demand | 0.06 A plus maximum 0.5 A per output |
| Analog Input Ranges | 0-10 V, +/-10 V, 0/4-20 mA |
| RTD Input Types | Pt100, Pt1000, Ni1000 |
| Analog Input Resolution | 12 bits for voltage/current; 0.1 deg C for RTD |
| Analog Input Impedance | Greater than 100 kohm for voltage; approximately 330 ohm for current |
| Analog Output Ranges | +/-10 V, 0-20 mA, 4-20 mA |
| Analog Output Load | 0-500 ohm for current outputs |
| Analog Conversion Cycle | 1 ms for voltage/current channels; 1 s with RTDs |
| Digital Input Filter | Typically 0.1 ms; configurable from 0.1 ms to 32 ms |
| Digital Output Capacity | 500 mA per channel |
| Total Digital Output Load | 4 A before installation derating |
| Product Status | Active, according to the supplied reference |
Ethernet Communication and I/O Configuration
The CI521-MODTCP exchanges cyclic process data with a Modbus TCP controller over 10/100 Base-TX Ethernet. Its internal switch and two RJ45 sockets support network connection through the interface.
Analog input channels support voltage, current and resistance-temperature detector (RTD) measurements. Configure each channel for the connected sensor type and signal range. Analog outputs provide configurable voltage or current commands for compatible field devices.
Digital inputs accept discrete field states, while transistor outputs switch connected loads. Observe the specified channel current and aggregate output load limits. The total output capacity requires derating according to the installation conditions.
Frequently Asked Questions
Q: Which analog input signal types does the CI521-MODTCP support?
A: Supported electrical ranges include 0-10 V, +/-10 V and 0/4-20 mA. RTD types include Pt100, Pt1000 and Ni1000. Configure each channel according to the connected sensor.
Q: What power supply requirements apply to the interface?
A: The specified process supply is 24 V DC at UP and UP3, with a system tolerance of -15% to +20%. Normal UP current is 0.20 A. UP3 demand is 0.06 A plus the output load current, up to 0.5 A per output.
Q: What limits apply to the transistor outputs?
A: Each digital output supports up to 500 mA, with a stated total load limit of 4 A before installation derating. Verify load current and supply capacity before connecting field actuators.
Field Installation Guidelines
- Mounting: Install the interface using the designated mounting hardware and the manufacturer’s installation instructions. Confirm mechanical clearance and access to both RJ45 connectors.
- Power supply: Verify the 24 V DC supply polarity and voltage at the specified UP and UP3 terminals before energizing the station.
- Ethernet wiring: Connect the interface to a compatible Modbus TCP network using suitable Ethernet cabling. Secure RJ45 connections and maintain separation from high-noise power conductors.
- Analog wiring: Match channel configuration to the sensor’s voltage, current or RTD type. Follow the manufacturer’s terminal and cable-shielding requirements.
- Digital outputs: Check the load current of each output and the aggregate current. Apply the required installation derating and confirm field-device compatibility.
- Commissioning: Verify the configured Modbus TCP connection, input and output process-data mapping, channel scaling and field signal response before placing the equipment in service.
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