Rockwell-automation 1395 Multi-Comm Hardware/Software Bedienungsanleitung PDF herunterladen (Seite 43)

Chapter 3

Configuration & Interfacing

3–32

Token Pass With Data This is a special mechanism built into the MCA board that allows the Drive

to transfer data between stations on a DH+ link along with the link token.

Refer to Figure 3–20. The amount of information passed is limited as

follows:

S Each station (each channel of an MCA board) can add two parameters

values to the list of values transferred with the token.

S Each station (each channel of an MCA board) can read up to four

parameter values from the available stations on the DH+ link.

Because this data is transferred with the network token, it is available to the

connected stations with a minimum of delay.

IMPORTANT: Data Highway + (DH+) is not designed for real time

control of data. Searching, monitoring large programs, and on-line

programming can degrade message throughput on this link since it can

perform only one of these functions at a time. Refer to the appropriate

PLC manual for details on the DH+ characteristics.

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Rockwell-automation 1395 Multi-Comm Hardware/Software Bedienungsanleitung Seite 43