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A PD 600 DPI is used to provide local programmable intelligence and act as a gateway between the standard P-NET system (RS485) and the local cluster via Light-Link P-NET.
The PD 600 has 2 standard P-NET Communication Channels.
Channel 1 is a standard P-NET RS485 communication channel for communicating with other P-NET devices outside the cluster, i.e. the rest of the system.
Channel 2 is a P-NET Light-Link communication channel intended for communicating with other locally mounted P-NET devices using the optical Light-Link interface.
See General Distributed Process Intelligence information for a general description of the DPI family.
The PD 600 DPI is programmed in Process-Pascal, which is an extension of standard Pascal, allowing easy declaration and utilisation of P-NET variables and objects. Programs are developed and compiled on a standard PC, then downloaded directly via a P-NET interface. Program code can be downloaded to FLASH memory.
The PD 600 DPI series devices have the channels shown in the following table.
The PD 600 DPI is available with 4 different memory versions: Small, Medium, Medium+ and Large. The amount and type of memory for each version is shown in the table.
PD 600 Block Schematic
The following figure provides a block diagram showing the internal structure of a PD 600 DPI