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PD 600x DPI with RS485 Interface



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.

It uses either the BM 002, or the BM 010 Base Module.


Communication interfaces

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.


Channel No.

Channel name

Channel description



Service channel



Comm. channel, RS485, P-NET mode or Data mode



Comm. channel, Light-Link, P-NET mode or Data mode



Channel for holding application licences (available in DPIs with operating system version 1.15 or higher)



Program channel for operating system



Program channel for Process-Pascal


See Overview, variables outside channels.



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.



RAM *)

Program FLASH


PD 600 S

64 Kbytes

64 Kbytes

128 Kbytes

PD 600 M

480 Kbytes

512 Kbytes

1024 Kbytes

PD 600 M+

992 Kbytes

512 Kbytes

1024 Kbytes

PD 600 L

480 Kbytes

1024 Kbytes

2048 Kbytes

*) 2 Kbytes of RAM reserved for system variables.


Memory details, Backup battery, LED indicators and real time Clock



PD 600 Block Schematic

The following figure provides a block diagram showing the internal structure of a PD 600 DPI





Electrical Specifications


Mechanical Details


Related topics

Ordering Information

Base module overview

Wiring diagram

PD 601x DPI with RS232 Interface

PD 602x DPI with Ethernet LAN Interface

RS485 communication channel

Light-Link communication channel

Licence Channel

Memory, backup battery, LED, RTC

Programming DPIs

DPI Program Channel

DPI Variables Outside Channels

DPI State diagram

Data acquisition