Pilz PSSu H PLC1 FS DP SN SD - Manual (Page 11)

Function description
Operating Manual PSSu H PLC1 FS DP SN SD
1001776­EN­04 11
4 Function description
4.1 Module features
4.1.1 Control system
The head module is a programmable logic controller (PLC), which can be used in safety­re­
lated and non­safety­related applications. The control system has memory areas for the op­
erating system, the data and the device project with the user program.
The head module has a non­volatile memory for the non­volatile variables.
User programs can be created in IEC 61131 programming and/or Multi programming.
For safety­related applications, the processor section is designed with multi­channel di­
versity.
The control system communicates with the input and output modules via the local module
bus and with the decentralised input and output modules via SafetyNET p. LEDs provide in­
formation on the status of the safety system and indicate any errors.
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.