Intelligent redundancy for P-Net systems
A
Proces-Data (UK) product story
Edited by the Engineeringtalk editorial team
Feb 18, 2004
A novel DIN rail mounted module provides the means to automatically switch communication from one path to another on detection of error or disconnection.
The addition of the PD 662 DIN rail mounted module to the M36 family of distributed fieldbus I/O and programmable devices from Proces-Data provides the means to automatically switch communication from one path to another on detection of error or disconnection.
Being a multi-net fieldbus, P-Net (IEC61158/4) has always had the means to be structured in a way so that alternate paths for the transmission of data can be used in the event of an error.
However, this facility requires the user to include monitoring routines in the control software.
The PD 662 P-Net Redundancy Interface is one of a number of standard clip together modules within the PD 600 series range.
Its main purpose is to provide a redundant and transparent link between optical light-link and a duplicated RS485 P-Net.
The module frequently scans the RS485 communication links to check whether the communication networks are functioning correctly.
The PD 662 will ensure that the local cluster of modules (ie the group of devices of which the PD 662 itself is a component), will receive data via one of the two RS485 P-Net ports, and that data from the local cluster will be transmitted to both RS485 P-Net ports.
If, for example, P-Net port 1 is active, and a short circuit or a cable break is detected, the PD 662 will automatically switch to P-Net port 2.
The module itself does not require any programming, but a P-Net slave address and a few other parameters must be configured.
The PD 662 is used with a BM 010 base module.
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