Concept
Terminal Bases
The terminal bases are used for SpaceLogic 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 SpaceLogic device installed to the right (next terminal base in the chain).
There are three different types of terminal bases for the SpaceLogic devices:
PS-24V power supply: one terminal block
AS-P servers: no terminal block
Central IO module: two terminal blocks
The terminal bases for the AS-P servers and Central IO module 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 AS-P server and Central IO 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.
Backplane Board
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 .
Automatic Device Addressing on the I/O Bus
Each device on the I/O bus 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 of the Central IO modules, the AS-P server, and the PS-24V power supply. The AS-P-3 server differs in that it is a one-piece device, without a terminal base, but the addressing works the same as for the two-piece devices.
For more information, see Automatic Device Addressing on the I/O Bus .
Device Installation
The SpaceLogic devices with the two-piece design are designed for installation on DIN rails in a cabinet.
For more information, see Device Installation .
I/O Bus
The I/O bus is a common bus that delivers power, address information, and communication to all devices connected to the bus. The term I/O bus also denotes the chain of devices that are connected together.
For more information, see I/O Bus .
Hardware Overview
PS-24V Power Supplies
AS-P Servers
AS-P-3 Servers
Central IO Modules
Central IO Modules v2
Backplane Board
Automatic Device Addressing on the I/O Bus
Device Installation
I/O Bus