Siemens SIMATIC TIWAY 1 Manual de usuario descargar pdf (Pagina 54)

OPERATION

AND

APPLICATION

UNILINK HOST

ADAPTER 2–44

USER MANUAL

UNILINK Host Adapter

Macro Response Buf

fer #A

Macro Response Buf

fer #B

Secondary

Data Packet

Figure 2–19 Link Macro Store and Forward Operation

Both macros must be disabled before the LINK MACRO command will be

accepted.

The trigger macro must be a valid Primitive 20 or A0 to read data from

the secondary device. The action macro must be a valid Primitive 30 or B0 to

write the data read to the other secondary. All of the define macro options on

each macro command buffer are valid until the link is established. When the

link

is established, the action macro will be considered non-repetitive. When the

link

is terminated the original conditions will be valid again.

The adapter will check the validity of the host supplied Primitives before

linking

them. The

Primitives must use the same TT type, but may use different

starting addresses (AAAA field of the Primitive). You must insure that the

number of TT types (NNNN field of Primitive) and the starting addresses are

valid

for both secondaries involved.

Once

the link

is established, just enable the trigger macro to begin the process.

The trigger macro behaves much like a non-linked macro, except that it is

disabled while the action macro executes. Each time the trigger macro

completes a read, the trigger macro is disabled, its data moved into the action

macro

buffer to create a valid write Primitive

and the action macro is enabled. If

the

trigger macro receives an error from the secondary

the action macro is not

enabled

and the exception flag is set disabling the trigger macro.

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Siemens SIMATIC TIWAY 1 Manual de usuario Pagina 54

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