Technical data

A-B SuperBridge Technical Reference

Unsolicited Messages Specification (page 19), which A-B data file was requested and the

number of elements. A row for a bad message contains requesting station number in octal

representation, the length (in bytes) of the message, the error return code issued, see Error

Codes Returned (page 22), and the message body itself, starting with the A-B command in hex.

In this example (Row 20), function 0x08 was requested (PLC-2 unprotected write), the address

requested was 01F8 (hex bytes), corresponding to word address 374 (Octal), indicating an offset

of 248 (decimal bytes) in the SB PLC-2 virtual memory map, since the PLC-2 base address in

this example is set to 200 (octal). Using the information in PLC-2 Unprotected Messages (page

21) to convert the PLC-2 address to a PLC-5 file element, this would be F14:24, which is a read-

only file, that can not be written to.

Function keys:

F1 Switch to The Home Screen (page 31)

F2 Switch to MC Data Screen (page 32)

F3 Switch to A-B File Copy Diagnostic Screen (page 37)

F4 Stop logging good messages

F5 Start logging good messages

F6 Stop logging error messages

F7 Start logging error messages

F10 Stop SB and return to the DOS prompt