The master VMEbus module releases the VMEbus network and the slave VMEbus module acquires the VMEbus network.

A method of performing a VMEbus split-read transaction (401) includes providing a master VMEbus module (102) coupled to a slave VMEbus module (104) through a VMEbus network (106).

The waveform generating and controlling unit includes the main module, computing module, distribution module, bus module, brief selecting module and real calculation module.

The slave VMEbus module places the set of data on the VMEbus network, wherein the set of data includes the tag identifier.

The master VMEbus module correlates the tag identifier to the split-transaction request and the master VMEbus module retrieves the set of data.

The master VMEbus module correlates the tag identifier to the split-transaction request and the master VMEbus module retrieves the set of data.

Depending on the provider, a different CPX fieldbus module is used.

The aim of the invention is to maintain a low current load of the bus module, in particular during the control of hydraulic valves (16).

The field appliances communicate with a memory-programmable control system (19) by means of a field bus module (20).

The master VMEbus module releases the VMEbus network and the slave VMEbus module acquires the VMEbus network.

The module-to-module bus has an output.

A system controller and a peripheral bus controller control the buses.

An arbiter employs both an address bus arbiter and a data bus arbiter for supporting pipelined, split bus transactions.

Each module transmits the identification signal after the module is initially connected to the power bus and the communications bus.

A method of performing a VMEbus split-read transaction (401) includes providing a master VMEbus module (102) coupled to a slave VMEbus module (104) through a VMEbus network (106).