Rockwell-automation 57C442 Data Highway Plus Interface Module Uživatelský manuál stáhnout pdf (Strana 30)

4-12

For the commands shown in figure 4.6, both logical binary and logical

ASCII addresses are supported.

The Diagnostic Read command returns the values for counters as

shown in Appendix G. The Diagnostic Status command returns 17

bytes containing the following information:

The commands shown in figure 4.9 write directly to or read directly from

file N7 on the module. The address field is used as an offset into the

file. If the address does not exist, an error is returned.

Unprotected writes will be processed in the same manner as Protected

writes and will not be permitted to store data in the protected areas of

the PLC-5 image in the dual port memory.

Command Function Description

06 07 Diagnostic Counters Reset

06 01 Diagnostic Read

06 03 Diagnostic Status

Figure 4.7 – Privileged Commands in the Basic Command Set

Byte Value Meaning

1 FE Terminal

2 1B Terminal

3 A3 Module identifier

4 Active station list pointer low byte

5 Active station list pointer high byte

6 Diagnostic counters pointer low byte

7 Diagnostic counters pointer high byte

8 Reserved

9 Reserved

10-17 Terminal name (automatically padded with blanks)

Figure 4.8 – Diagnostic Status Command Data

Byte Value Meaning

02 n/a Protected Bit Write

00 n/a Protected Write

05 n/a Unprotected Bit Write

01 n/a Unprotected Read

08 n/a Unprotected Write

Figure 4.9 – Non-Privileged Commands in the Basic Command Set

1 2 ... 25 26 27 28 29 30 31 32 33 34 35 ... 61 62

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Rockwell-automation 57C442 Data Highway Plus Interface Module Uživatelský manuál Strana 30