SPECIFICATIONS
Part No.: IC660BBD021
Manufacturer: General Electric
Country of Manufacture: United States of America (USA)
Rated Voltage: 24/48 VDC
Number of Points:16
Input Range: 18-56 VDC
Load Current: 2 Amp
Operating Voltage: 18-56 VDC
Product Type: Sink I/O Block
Availability: In Stock
Series: Mark I and II
Functional Description
IC660BBD021 is a Sink I/O Block developed by GE. It is a part of Mark I and II control system. It is a 24/48 VDC Sink I/O block that is an integral component of the Series 90-30 PLCs. Designed to interface seamlessly with both electromechanical devices and 3-wire solid-state sensors, this block provides essential connectivity and control functions within industrial automation systems. It offers 16 discrete circuits that can be flexibly configured as inputs, tristate inputs, or outputs, making it a versatile tool in various automation applications.
Features
- This I/O block operates on a 24/48 VDC power supply, which is provided by field output devices. Does not require an additional power source for the circuits, as they are powered directly by the block itself. Each of the 16 discrete circuits can serve different functions, including input, tristate input, or output roles. The ability to configure circuits for different roles enhances the block's flexibility and functionality in diverse control scenarios.
- Offers several configurable parameters that enhance its operational versatility. These include options for output pulse testing, input filter timing, output power-up defaults, and the ability to hold the last state or revert to a default state after power cycles.
- Additionally, the block is equipped with built-in protection mechanisms to safeguard against potential issues. It features electronic short circuit and over-temperature protection, as well as the ability to detect faults such as failed switches, open wires in tristate inputs, and overload or no-load conditions. These protections are crucial for preventing damage and ensuring reliable operation.
Installation Requirements and Safety Considerations
- The block should be housed in a protective case to shield it from airborne contaminants and ensure adequate cooling and airflow.
- It is also essential to implement a proper grounding system to prevent electrical issues. The 16 circuits are connected through terminals 6 to 21, which can be used for both inputs and outputs. When configuring a terminal as a tristate input, a resistor should be mounted at the dry contacts of the input device to facilitate open wire diagnostics.
- When performing maintenance or replacing components, it is crucial to follow proper safety procedures. Always disconnect both block power and circuit power before handling the unit to avoid electrical shock hazards.
- For replacing an electronic assembly, connect a handheld monitor to the system to monitor circuits from the HMM menu. Once the monitoring is complete, turn off and disconnect the monitor, power down the block, remove the old assembly, and install the new one. Ensure that the terminals are correctly connected to the + or – side of the terminal board based on their intended use as inputs or outputs.
Inputs and Outputs Configuration
- When set to inputs-only, all 16 circuits on the block operate as input channels. These can be configured as regular inputs or tristate inputs, allowing customization based on specific application requirements. In this mode, the block uses 16 input references, ensuring seamless data transmission to the CPU. Importantly, no output references are required. This configuration is ideal for monitoring devices like switches, sensors, and other input systems, providing real-time status updates to the control system.
- In the outputs-only setup, all 16 circuits function exclusively as output channels. This mode is designed to control external devices such as actuators, relays, or signal lights. The block uses 16 output references, eliminating the need for input references. Notably, this configuration does not include feedback analysis, which means the block will not verify the actual state of the output devices after sending commands. This setup is most effective when precise feedback is not critical for system performance.
- The combination block mode provides the highest degree of versatility by enabling a mix of input and output circuits. Each of the 16 circuits can be independently configured as an input, tristate input, or output. This mode is suitable for applications requiring simultaneous input monitoring and output control. In this setup, the block uses 16 input references and 16 output references, enabling full-duplex communication. The state of each output circuit is relayed back to the CPU through corresponding input references. This feedback mechanism allows the CPU to monitor the performance of output devices, ensuring they are operating as commanded. The system can also verify that the load is receiving the correct voltage and current, providing an additional layer of reliability.
Diagnostics
- Overtemperature Diagnostic: Each circuit features a built-in thermal sensor that triggers an OVERTEMPERATURE message if the block's internal temperature exceeds 100°C. The circuit is then turned off to protect internal electronics. This diagnostic is performed for both inputs and outputs.
- Short Circuit Diagnostic: Output circuits are protected by sensors that detect short circuits. If the instantaneous current exceeds 10 amps during restart attempts, the output circuit is forced off, and a SHORT CIRCUIT message is sent. The diagnostic must be cleared via a Handheld Monitor (HHM) or CPU after resolving the fault.
- Failed Switch Diagnostic: This diagnostic monitors discrepancies between the circuit's commanded and actual states. If a fault is detected, a FAILED SWITCH message is sent, and the circuit logic is set to OFF. The diagnostic also identifies internal power supply faults and communication issues with the block’s microprocessor.
- No Load Diagnostic: This optional diagnostic alerts operators when a circuit fails to draw 50 mA continuously after activation. While useful for monitoring load conditions, it is not suitable for circuits with minimal loads like small relays or lamps.
- Overload Diagnostic: Enabled per output, this diagnostic turns off the circuit and sends an OVERLOAD message if the load exceeds 2.8 amps DC for more than 10 milliseconds. Duty cycle limitations and ON-time restrictions are in place to avoid overheating and maintain block integrity.
The WOC team is always available to help you with your Mark I and II requirements. For more information, please contact WOC.
Frequently Asked Questions
What is IC660BBD021?
It is a Sink I/O Block developed by GE under the Mark I and II series.
What are the configurable parameters of the module?
Configurable parameters include output pulse test, input filter time, output power-up defaults, and output hold last state or default.
What protection features does it have?
The block includes electronic short circuit and overtemperature protection, as well as fault detection for failed switches, open wires, overloads, and no-load conditions.
How should the module be installed?
Install the block in a protective case with adequate cooling and airflow. Ensure it is grounded properly.
