Universal Safety Interface

The USI-0002 communication module handles Ethernet and Serial communication with external devices, e.g. Experion™ PKS and Safety Builder. It is located in the Controller chassis (see section CPCHAS-0001 or CPCHAS-0002 or CPCHAS-0003)

The below figure shows the front view of the USI-0002 module.

The main function of communication modules is handling the communication to and from external devices and other Safety Managers. The USI-0002 has four (4) independent communication channels. See the below table for the relevant details.

Furthermore, the USI-0002 communication module acts as hardware firewall, protecting the safety functions within Safety Manager. It has:

enhanced protective capability,

high internal memory for running multiple demanding communication protocols in parallel

The module consists of the following items:

A Motorola 8270 communication processor.

EEPROM to store specific module data, such as the two MAC-addresses and the hardware revision number.

8 Mbyte Flash memory to store the system and application program. The flash content is copied to SRAM at startup and is executed from there. The flash content can be updated without removing the USI-0002 from the Controller chassis.

8 Mbyte Local SRAM (with Error Detecting and Correcting logic) for system and application program and information.

256 kilobyte shared RAM for data exchange between the USI-0002 and the Control Processor

Two dual-speed fast ethernet transceivers

Two general purpose serial communication controller channels.

Reset mechanism

The USI-0002 module resets hardware via the following mechanisms:

l Power-up or power-dip.

l If the Quad Processor Pack (key switch) goes in ‘STOP’ mode.

l If the Quad Processor Pack generates a COMmunication RESet.

The communication channels are reset (go offline) if:

l the module resets, or

l the dedicated watchdog times out.

Hot swap

The USI-0002 module has ‘hot swap’ features.

This means that the module may be placed or removed in a running system. The application program will not be interrupted by these actions.
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