Services
75
10/00 AWB27-1301-GB
Behaviour of the service when the FB “acd” input is
connected
Secondary stations activate the FB “acd” input to signal to
the primary station that they have high-priority data for
transmission.
If an ACD request is detected while service 32 (send token)
is in progress, the secondary station responds with ACD data
in a variable length frame.
If an ACD request is detected while another service is in
progress, the current service is first ended. Once the service
has been completed, the primary station requests the ACD
data from the secondary station. The secondary station
transfers the ACD data to the primary station in a variable
length frame.
At the primary station, the active “acd” output indicates that
the ACD data was stored in the receive data array
(“acd_sadr”, “acd_subaddress”, “acd_offset”,
“acd_length”). The “acd” output is reset by the next frame.
If an error occurs at the secondary station while the frames
are being processed, the ACD data is not transferred.
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