Rockwell-automation 1760-xxxx Pico GFX-70 Controllers User Manual Manual de usuario descargar pdf (Pagina 307)

1 Publication 1760-UM002B-EN-P - March 2005

Chapter

6

Pico-Link and Point-to-Point Serial

Connections

Introduction to Pico-Link

All Pico GFX-70 units have Pico-Link terminals. The Pico-Link is designed

for eight stations.

Using the Pico-Link you can:

• Process additional inputs and outputs.

• Implement faster and improved control using decentralized

programs.

• Synchronize date and time

• Read and write inputs and outputs.

• Send values to other stations.

• Receive values from other stations.

• Load programs from or to any station.

The Pico-Link is based on the CAN network (Controller Area Network).

CAN is specified by the ISO 11898 standard. CAN has the following in-built

features:

• Message oriented transmission protocol.

• Multimaster bus access capabilities with non-destructive bit-wise

bus arbitration via priority messaging (Arbitration: An instance

which defines which hardware can use the bus next).

• Multicast broadcast messaging with receiver side message

filtering.

• High level of real-time capability (short reaction time for high

priority messages, short fault message get times).

• Functionality in environments with severe interference (short

block lengths).

• High level of error security.

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