Siemens SIMATIC TIWAY 1 User Manual page 13

OPERATION AND APPLICATION
Commands
Host
Computer
Figure 2–3 Host Computer To UNILINK Host Adapter
Commands are checked for errors before they are executed. The ERROR
RESPONSE is a special response that returns a code indicating the type of
error. If an error is found, the command will not be executed and the ERROR
RESPONSE will be returned. The ERROR RESPONSE will also be returned if a
network request does not complete within the host command timeout. The
possible error codes that may be returned in the ERROR RESPONSE and
corrective actions to take are listed in Chapter 6.
UNILINK
Host Adapter
Responses
Communications
2–3
Secondary
Secondary
UNILINK HOST ADAPTER
USER MANUAL