Pilz PSSu H FS SN SD - Manual (Page 11)

Function description
Operating Manual PSSu H FS SN SD(­T)(­R)
1001451­EN­08 11
4 Function description
4.1 Module features
4.1.1 Decentralised inputs and outputs
The head module belongs to the performance class "Decentralised system PSSu I/O". It
enables the PSSuniversal to be used as a modular, decentralised input/output module:
} PSSu system without control functionality
} Electronic modules and/or compact modules must be added to the head module
} I/Os are controlled via SafetyNET p by means of a control system (e.g. PSSu PLC)
4.1.2 Supply voltage
4.1.2.1 Function description
The product provides the module supply and periphery supply for the modules on the mod­
ule bus:
} Module supply
Supply voltage for subsequent module (right­hand side)
} Periphery supply
Supply voltage for sensors, actuators and test pulses
When the supply voltage is fed in separately, the module supply and periphery supply are
galvanically isolated. If galvanic isolation is not required, a common power supply may be
used for the periphery supply and module supply.
4.1.2.2 Current load capacity
Ensure you comply with the current load capacity of the module and periphery supply (see
"Technical Details"). If the current load is higher, an additional supply voltage module is re­
quired to refresh the module supply and periphery supply.
} Module supply
The current load is the total current consumption of all the electronic and compact mod­
ules.
The module supply does not automatically switch off if values exceed or drop below
their limits. However, the "5 V" LED will light and a message will be entered in the dia­
gnostic list.
} Periphery supply
The current load is the total current consumption of the sensors, actuators and test
pulses supplied via the input/output modules.
The periphery supply does not automatically switch off if values exceed or drop below
their limits. However, the "24 V" LED will light and a message will be entered in the dia­
gnostic list.
Please refer to the derating diagrams.