The Pluto is designed for applications which fulfil IEC-EN 60204-1 and with special attention to:
- “Transformers shall be used for supplying the control circuits”.
- “Where several transformers are used, it is recommended that the windings of those
transformers be connected in such a manner that the secondary voltages are in phase”.
(see EN 60204-1, 9.1.1)
These requirements are relevant for connection of the relay outputs.
- For electrical safety reasons and in order to be able to detect safety critical earth faults in
single channel circuits, the 0V terminal must be connected to protective bonding circuit.
(see EN 60 204-1, 9.4.3.1 Method a).
Pluto is a programmable safety system intended for safety applications where it is not accepted
that faults in the control system lead to loss of a safety function. To achieve this requirement
the system is designed with integral redundancy and monitoring. Unlike ordinary PLC systems,
Pluto utilizes two microprocessors, which both control and monitor each safety function for
correct operation. Each input to the system is separately connected to each processor, each
having their own memory and executing their own program. The processors continuously
compare the results with each other to ensure integrity of data.
Each safety output is connected to both processors and cannot be set unless both have
checked that the logic conditions in the application program are fulfilled.
Each Pluto unit has connections for CAN-bus and can be interconnected with other Pluto units.
The degree of safety is the same over the bus as it is within each unit.
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