The terminal bases are used for SmartX devices that are based on the patented two-piece design. The terminal base provides the I/O bus to the electronics module installed on the terminal base as well as to the SmartX device installed to the right (next terminal base in the chain).
There are four different types of terminal bases for the SmartX devices:
PS-24V power supply: one terminal block
SmartX AS-P servers: no terminal block
Automation Server: one terminal block
I/O modules: two terminal blocks
The terminal bases for the SmartX AS-P servers, Automation Server, and I/O modules have the same backplane boards, which are connecting the power bus, the address bus, and communication bus from the left bus connector to the right bus connector. A common name for these buses is the I/O bus.
The terminal base for the PS-24V power supplies has a different backplane board, which does not pass through the power bus input from the left connector. The PS-24V power supply supplies power to the SmartX server and I/O modules installed to the right. The ground connection is connected from the left bus connector to the right bus connector in all terminal bases, because it is used as a common signal ground for the address bus as well as the communication bus.
A backplane board is mounted in the terminal base for the W1 width devices. The backplane board is equipped with two 2x5-pin bus connectors, a 2x6-pin electronics module connector, address logic circuitry, and a device label.
For more information, see Backplane Board .
Each device can detect its order in the chain of connected devices and assigns itself an address accordingly. This auto-addressing feature is provided by the terminal base backplane.
For more information, see Device Addressing .
The devices are designed mainly for installing on DIN rails in a cabinet.
For more information, see Device Installation .
The I/O bus is a common bus that delivers power, address information, and communication to all devices connected to the bus. The I/O bus is provided to the devices through the backplane in the terminal bases. The term I/O bus also denotes the chain of devices that are connected together.
For more information, see I/O Bus .