Siemens SIMATIC TIWAY 1 - Manual (Page 48)

OPERATION AND APPLICATION
UNILINK HOST ADAPTER 2–38
USER MANUAL
2.10.4.3 Define The Macro
Use the DEFINE MACRO command, code 14, to define the macro and the macro
options. Figure 2–18 shows the DEFINE MACRO command frame. Macros can
connect a secondary, disconnect a secondary, or send a Primitive to a secondary.
These three functions are the macro types as shown in Table 2–2. The “connect”
and “disconnect” secondary macro types do not require any buffer storage to
hold the command, only 22 bytes for the header.
14
Source Buffer Secondary Macro Options Minimum Primitive
Id # Address Type Byte
Reissue
Delay
Data
Figure 2–18 Macro Command Frame
Table 2–2 Macro Types
Type
Code
01
02
03
Function Performed
Send Primitive to secondary
Connect the secondary
Disconnect the secondary
The UNILINK Host Adapter will return the Command Code, the Source
Identification number, and the buffer number to indicate that the command
was accepted. However, this does not mean that the secondary was actually
connected because macros are scheduled for later execution. When the
“connect” secondary macro is executed, the MRSW will be set to indicate if the
connect was successful or if not, why it failed. The “disconnect” secondary macro
type works just like the “connect” secondary type except that the secondary is
disconnected rather than connected. Both the “connect” and “disconnect”
secondary macro types are automatically enabled for execution when the
command is accepted from the host computer.