4 INTERBUS S

The Interbus S system (DIN 19245 part 1.2) is set up as a data ring with a central master slave access procedure. All modules are understood as one logical module. Each partner receives data at its input and sends it to the next partner at its output. There is no addressing with a data frame because each partner knows by special control signals (CLOCK, RESET, SELECT, CONTROL) where it is placed in the ring. So there is no bus address. „Addressing“ is done via the physical place in the system.

Interbus S has the structure of a spatially distributed shift register. Each cycle is input and output at the same time. While the master gives output data to the shift register, it gets input data from the other end of the ring.

Each part of Interbus S has an ID register. This register keeps information about the type of module, the number of I/O registers and the status and error information.

Interbus S has two general operating modes:

1) ID cycle

The interface module of all devices connected to the bus system reads out the ID register in the ID cycle and builds up the process image with the aid of this information. The cycle serves as an initialization and is carried out on request.

2) Data cycle

Within the data cycle all input data from the registers is transferred from all devices into the master card (Host Controller) and all output data from the master card (Host controller) to the devices.

4.1 Master Cards (Scanners, Host Controllers)

The operation of the master is carried out in most cases via a central controller like a PLC, PC or NC. Connection to the remote stations is made via master cards.

Common master modules are:

-Phoenix IBS S5 DCB/I-T

-Phoenix IBS S5 DSC/I-T

-Phoenix 100 CB-T

-Hilscher CIF 30 (via Synergetic Micro Systems in USA)

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4.2 Configuration software

In order to make the connection between a PLC or PC and the remote stations, the master cards must be configured with the individual station data.

For this, the following software packages are available. For example, the following are available from Phoenix:

-IBS SYS SWT

-IBS CMD SWT

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