The ABB SPA-ZC21 is a specialized bus connection module designed to interface SPACOM secondary devices with a fiber-optic SPA bus. This unit functions as an electrical-to-optical converter, facilitating communication between substation secondary devices and higher-level monitoring or control systems.

Features

• Standardized SPA to RS-485 conversion
• Supports multiple relay configurations
• Flexible optical interface options for glass or plastic fiber
• Selectable data transfer rates (300 to 19,200 bit/s)
• Integrated DIP switch configuration for master/slave and communication mode selection

Technical Specifications

Installation Guidelines

• The module is designed to plug directly into the 9-pin D-type subminiature connector on the rear plate of the host SPACOM device.
• Ensure the device is powered down before installation or removal of the module.
• Configure the communication mode (SPA or RS485) and echo checking (Slave/Master) using the front-panel DIP switches prior to commissioning.
• If fiber routing requires adjustment, the internal PCB can be rotated 180 degrees by removing the two cross-slotted screws and reassembling the cover accordingly.
• Handle with standard ESD precautions to prevent damage to internal circuitry.

FAQ

What is the primary function of the SPA-ZC21?

It connects substation secondary devices, such as relays, to a fiber-optic SPA bus system, allowing seamless data transmission between the device and a higher-level system.

What devices is it compatible with?

The module is compatible with any SPACOM device equipped with a 9-pin D-type connector.

Does the module require configuration?

Yes, the module requires configuration via front-panel DIP switches for communication mode (SPA vs RS485) and echo checking (Master/Slave). Additionally, the internal PCB orientation may be adjusted to match specific fiber-optic cable requirements.