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Appendix F

DL205 Memory Map

Peer Master

Example

Host Master

Example

F–6

DL205 Data Types and Memory Map

You can use Data Type 39 to obtain DirectNET diagnostic status. The following

tables show the reference addresses for the various types of information and the

DirectNET error codes (used with address 0000).

DirectNET Reference Data Returned

0000 Last error and previous error*

0002 Number of successful communications

0004 Number of erroneous communications

0006 Number of retries for header

0008 Number of retries for data

* The last error code is contained in the most significant byte. The previous er-

ror code is in the least significant byte. Two codes that are displayed are

cleared by two successful communication exchanges.

Error

Code

Applicable

Data Type

Error Description

00 All types The transfer was successful.

01 All types A timeout occurred in the serial link.

03 32, 33 A request was made to read or write a non-existent I/O point.

04 32, 33 A request was made for data of more I/O points than are available.

05 All types A request was made to read or write odd bytes. The number of data requested

was not a multiple of 4 in the ASCII mode.

06 31 A request was made to read or write one or more non-existent memory

locations.

07 All types A request was made to read or write a zero data byte.

08 36 An attempt was made to write a protected memory.

09 All types An invalid code is specified or an attempt was made to write to an invalid

address.

0A 39 A request was made to read or write one or more non-existent diagnostic status

words.

0B 36, 39 An invalid starting address is used in the PC type read, scan start/stop,

diagnostic status read or write request.

0C All types Three attempts were made to transmit the header.

0D All types Three attempts were made to transmit the data.

0F All types The header unit number is incorrect. An invalid function was requested.

14 All types One or more errors occurred during the data block transfer. Possible errors are:

invalid STX, ETC, LRC, or ETB is received; a parity, framing, or overrun error

occurred.

15 All types EOT from the master station could not be received.

16 All types A code other than ACK or NAK was received.

1D 31, 33, 36 There is a format error in the non-header portion of the message.

1E All types There is a format error in the header block.

Data Type 39

Diagnostic Status

1 2 ... 196 197 198 199 200 201 202 203 204 205 206 207

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