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Universal Function Blocks
74
10/00 AWB27-1301-GB
Service 32: Send token (temporary status)
Service 32 is used in conjunction with the “acd” input to
ensure an effective exchange of data between the primary
station and connected secondary stations.
If no high-priority data has been signalled since the last
communication (“acd” = 0), the secondary station responds
with a temporary status token. In this way it is possible to
check the operational readiness of the secondary station.
If high-priority data has been signalled (“acd” = 1), the
secondary station transfers 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,
provided that no new ACD data is transferred.
Figure 25: Service 32: Send token (temporary status) if “acd” = 1
(secondary station)
acd_subaddress
acd_subaddress
ac
d
_
length:=
acd_offset
acd_offset
2
0
1
. . . 255
10
30
40
50
60
70
80
90
219
0
2
0
1
. . . 255
10
20
40
50
60
70
80
90
219
0
30
Subaddress
RAM receive data array
Primary station
Subaddress
Offset
address
RAM send data array
Secondary station
Offset
address
Содержание S40-AM-TL
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