Function description
Operating Manual PNOZ mml2p
1002234-EN-04
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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
Operation
The link module PNOZ mml2p is used to safely transfer the input information from decent-
ralised modules to the safety system PNOZmulti.
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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Communication with the decentralised modules is via a safe data link.
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The link module PNOZ mml2p reads the input information from the decentralised mod-
ules as part of each cycle and then forwards it to the base unit.
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At the end of a PNOZmulti cycle, the base unit sends its output data to its link module.
This output data is immediately sent to the decentralised modules.
Linking several decentralised modules:
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A maximum of 4 link modules can be connected to a base unit PNOZmulti Mini.
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A maximum of 4 decentralised modules can be connected to a link module PNOZ
mml2p.
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If a decentralised module receives data intended for a different decentralised module
that is connected, the data is forwarded without being processed.
