Function Description
Operating Manual PNOZ ml1p
21575-EN-06
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4
Function Description
4.1
Integrated protection mechanisms
The relay conforms to the following safety criteria:
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The circuit is redundant with built-in self-monitoring.
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The safety function remains effective in the case of a component failure.
4.2
Functions
The PNOZ ml1p link module is used to safely transfer the input information from 32 virtual
inputs and 32 virtual outputs between two PNOZmulti systems. One link module is as-
signed to each base unit. Data is exchanged cyclically.
The function of the inputs and outputs on the control system depends on the safety circuit
created using the PNOZmulti Configurator. A chip card is used to download the safety cir-
cuit to the base unit. The base unit has 2 microcontrollers that monitor each other. They
evaluate the input circuits on the base unit and expansion modules and switch the outputs
on the base unit and expansion modules accordingly.
The LEDs on the base unit and expansion modules indicate the status of the configurable
control system PNOZmulti.
The online help on the PNOZmulti Configurator contains descriptions of the operating
modes and all the functions of the control system, plus connection examples.
Data exchange:
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Data is exchanged cyclically.
}
After the end of a PNOZmulti cycle, each base unit sends its output data to its link mod-
ule. This output data is immediately sent to the link module on the other base unit.
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At the same time, the base unit reads the input data from the link module.
Connection of multiple base units:
Any number of base units can be connected via PNOZ ml1p link modules. Two PNOZ mI1p
are required for the connection between two base units. However, only a maximum of 4 link
modules may be connected to any one base unit.
Data transmission time:
The data transmission time t
BUS
is the time between the virtual output at base unit 1 being
set and the virtual input at base unit 2 becoming available (see
Technical details [
22]
).
