Pilz PSSu K S RS232 Modbus ASCII - Manual (Page 13)

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4-1
4.1 Module features
4 Function description
4 4000 Function description Function description 4- 4.1 Module features 4100 Module features 4- 4.1.1 Function description
Function description 4- ][Funktionsbeschreibung BA Einleitung Ser
The module enables communication via a serial interface.
][Funktionsbeschreibung Module Supply
Module supply
 The module supply provides the module with voltage.
][Funktionsbeschreibung_Peri Ser
Periphery supply
 The periphery supply provides the serial interface with voltage.
][Funktionsbeschreibung Datenaustausch Ser
Signal processing
 In each cycle, a max. of 8 Bytes of data can be transferred in both di-
rections between control system and module. The data to be trans-
ferred is stored temporarily in a send and receive buffer.
 Two additional status bytes and control bytes are available in the
process image for data exchange between control system and mod-
ule.
 All the configuration data is stored in the head module and is assigned
to the module on restart. This way the configuration data is retained
even if you change the module.
][Funktionsdiagramm ST RS232 Modbus ASCII
Schematic representation of signal processing with the control system
PSSu PLC/PSSu multi:
4.1.2 Integrated protection mechanisms
Integrated protection mechanisms 4- ][Schutzmechanismen E/A-Module
When the PSSu E F PS1(-T) is used to supply the system, the module
supply is buffered for 20 ms if the supply voltage is interrupted.
][Schutzmechanismen ST-Module
The module detects the following errors:
 Start-up error
 Configuration error
 ST communication error
 Bus termination error
Ext. device
with serial
interface
RS232
PSSu K S RS232
Modbus ASCII
Head
module
with
control
system
Module
bus