Rockwell-automation 1770-KF2 Data Highway or Highway Plus Interface Mo Instrukcja Użytkownika Pobierz pdf (Strona 89)

Message Packet Formats

Chapter 5

5-10

Diagnostic Loop

You can use this command to check the integrity of transmissions over the

communication link. The command message transmits up to 243 bytes of

data to a station interface module. The receiving module should reply to

this command by transmitting the same data back to the originating

station.

Command

Format:

Reply Format:

TNSSTSCMD

SRCDST FNC

TNSSTSCMD

SRCDST

DATA

— Max. 243 Bytes

DATA

— Max. of 243 Bytes

Diagnostic Read

This command reads up to 244 bytes of data from the PROM or RAM of

the station interface module. You can use it to read the module’s

diagnostic timers and counters. Except for the PLC-5, you must use the

diagnostic status command to obtain the starting address of the diagnostic

counters. The PLC-5 doesn’t require that this address be specified,

though you must include a dummy value in the ADDR field, which the

PLC-5 will ignore.

Command

Format:

Reply Format:

TNSSTSCMD

SRCDST FNC

TNSSTSCMD

SRCDST

ADDR

DATA

— Max. of 244 Bytes

SIZE

1 2 ... 84 85 86 87 88 89 90 91 92 93 94 ... 234 235

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Rockwell-automation 1770-KF2 Data Highway or Highway Plus Interface Mo Instrukcja Użytkownika Strona 89