Rockwell Automation 1775-S5_SR5,D17756.5.5 User Manual PLC-3 FAMILY I/0 - Manual (Page 167)

DH/DH+ Error Codes
Appendix B
B-2
A value of F0 (hex) in the STS byte indicates that the EXT STS byte
actually contains the error code for the reply message.
The meaning of each error code depends on the command message that the
local station receives from a remote station. Table B.A describes the error
conditions that the various commands can generate. The error codes are
listed according to the decimal value that the command at the initiating
station stores.
When a remote station transmits a command, the local scanner might issue
a reply message that contains one of the error codes listed in Table B.A.
Error codes 81–87 appear in the STS byte of the reply message, and codes
231–241 appear in the EXT STS byte.
The scanner receives remote error codes in a reply to a command it has
sent to a remote station. The message instruction sets the error bit and
records the error in the message control word (see “Ladder Program,” page
4-6). The module also stores the local error code in the user symbol
ERROR (see “DH/DH+ Message Procedure Diagnostics,” page 7-1).
The meaning of a particular remote error code varies depending on the
type of communication interface module at the remote station. If the
remote station is a PLC-3 controller with a scanner as the interface module,
the remote error codes have the meanings listed in Table B.A. For the
meanings of other remote error codes, refer to the appropriate user’s
manual for the communication interface module at the remote station.
Remote Error Codes