Instruction Manual PROTECT-PSC
V 2.6R01 / 04.19
1
–6
1.4.3
Area of use
The PROTECT-PSC has been developed particularly for use in small plants.
The PROTECT-PSC can be used in applications up to Performance Level (PL) e,
Category 4 to ISO 13849-1 or the Safety Integrity Level 3 (SIL) to IEC 61508 in
which the safe state is the deenergized state.
The PROTECT-PSC is intended for use in control circuits to IEC 60204 for a rated
voltage for 24 VDC. The appropriate shock-hazard protection requirements are to
be met in the applications.
1.5
Mode of operation
1.5.1
Hardware
CPU module and Safety Input/Output modules consists of two systems working
independently of each other. Each system is controlled by a microprocessor. The
systems monitor each other. In the case of a 2
–channel connection, the individual
channels are each monitored by a microprocessor. Self-monitoring enables all
internal defects to safety-relevant components to be detected within the module.
Each module performs a complete self-test at regular intervals.
Non-Safety Input/Output modules consists of one systems. A system is controlled
by a microprocessor.
1.5.2
Software
The programmer creates the user program in the form of a ladder diagram (to IEC
61131) using the PROTECT-PSCsw programming software. For purposes of
verification the ladder diagram is converted to a statement list. After having been
checked by the programmer supported by the programming software the user
program is translated into a format which can be read by the processor module and
can then be transferred to the processor module via a USB interface.
After successful transfer to the processor module the latter sends the user program
back to the programming software for checking. After comparing it with the
transmitted program the user program is released for operation..
During ongoing operation the processor module compares its data with the states
of the Input modules and reacts with the appropriate instructions for the Output
modules, depending on the stored user program.
CPU module and Safety Input/Output modules guarantee a safe switching of the
desired output (switching off all outputs in the case of errors) within 37.6 ms (Mode
3) or 67.6 ms (Mode 1), each including an assumed relay release time of 15 ms.
In case of error the operational outputs are switched off.
Summary of Contents for PROTECT-PSC
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