Siemens SIMATIC TIWAY 1 - Manual (Page 119)

HOST COMMAND SET REFERENCE
UNILINK HOST ADAPTER 5–34
USER MANUAL
05 = the macro buffer specified has not been defined yet. Issue
the DEFINE MACRO command and then reissue this request.
06 = the macro buffer specified is the trigger macro in a link
macro pair which cannot be explicitly enabled at this time
because the action macro response has not returned. Wait for a
short interval and reissue this request again.
07 = the specified macro buffer cannot be enabled because the
secondary device associated with it is offline.