Power supply considerations

The supply of the FieldBusPlug is always made via the bus cable. This enables the FieldBusPlug to monitor the actual (e.g. faulty) status to the control station even when it is removed from the device or when power down appears on the device.

Additional it is possible to supply simple components such as proximity switches or the devices MSD11 and MSR22 via the bus cable of the FieldBusPlug.

The S500-FBP remote I/Os are only powered through the bus cable. As the needed current is depending on the number and type of the I/O modules used, a total current of up to 50 mA could be necessary additionally to the current needed for the FBP itself (about 46 mA).

When the distance between master and slave or cabinet is high, the power supply of the slaves should be provided locally in each cabinet.

Note

Notes: Prefer separate supply units or separately fused supply circuits for the FieldBusPlug line and the devices (not possible for S500-FBP which could only powered through the bus lines).

For the FBP devices with selector switch for power supply, check carefully whether the switches of the devices are set to EXT before delivering to the installation site.

Always check the supply situation using the calculation scheme in the chapter below. Do not forget to check the total bus length.