Technical data

A-B SuperBridge Technical Reference

PLC-2 Unprotected Read

See [6], page 3.2-8. With A-B terminology, this is command 0x01. Data will be returned if the last

element requested is within the SB file range for F15, mapped into a PLC-2 memory image, as

described above. If other elements are requested, or the length in bytes of the requested data

table is greater than 244, error code 0x50 is returned. Note that it is possible to request data that

passes mapped PLC-5 file boundaries, i.e. the element following the last N13 element is F14:0.

PLC-2 Unprotected Write

See [6], page 3.2-9. With A-B terminology, this is command 0x08. The start element and the

number of elements must be entirely within the PLC-2 mapped image of N13 or F15 in order to

be accepted. If other elements are requested, or the length in bytes of the transmitted data table

is greater than 244, error code 0x50 is returned. It is not possible to write to N13 and F15 with

one message, since F14, which is read only, is mapped between the two.

ERROR CODES RETURNED

The following error codes are returned if there is a problem with an unsolicited message:

0xF006 “Address doesn’t point to something usable” (Not N12, N13 F14 or F15).

0xF009 “Data file is too large” (more than 100 N12 or N13 elements requested or more

than 50 F14 or F15 elements requested).

0xF00A “Transaction size plus word address is too large” (Element beyond the last

element requested).

0xF00E “Command cannot be executed” (message not supported by SB).

0x50 “Addressing problem or memory protect rungs” (PLC-2 addressing problem)