ABB ARC600 User Manual page 63

1MRS758459 J
Name
Max clients
IEC-104 settings
TX window size (k)
RX window size (w)
I frames TX timeout (t1) It defines the timeout in seconds the device
I frames RX timeout (t2) This defines the timeout in seconds from the
Link test interval (t3)
Test link on suspended
state
Suspended timeout
Table continues on the next page
ARC600
User Manual
Description
Max clients defines the maximun number of con-
nections (redundancy group).
The IEC-104 settings define the properties of
IEC-104 link layer and application layer parame-
ters as described in the IEC 60870-5-104 stand-
ard. The IEC-104 communication is carried out
between the device and the IEC-104 master over
the TCP/IP network.
TX window size defines the maximum num-
ber of I format APDU packets the device may
send before requiring the IEC-104 master to ac-
knowledge them. If there are k unacknowledged
frames sent the device stops polling IEC-101
slave for events until acknowledgement is re-
ceived. The k must be always less than the
maximum sequence number defined below. The
IEC-104 standard suggests k to be 12.
RX window size defines the maximum number
of I format APDU packets the device may receive
before sending acknowledgement to the IEC-104
master. The w should not exceed two-thirds of
TX window size k. The IEC-104 standard sug-
gests w to be 8.
waits for acknowledgement from IEC-104 mas-
ter after sending last I format APDU or control
frame (e.g. link test). If no acknowledgement is
received during the defined time the device will
close the network connection and the IEC-101
link. The t1 must be longer than the network
round-trip-time. The IEC-104 standard suggests
15 seconds.
last received I format APDU before sending ac-
knowledgement. The t2 must be smaller than t1.
The IEC-104 standard suggests 10.
This defines the interval in seconds how often
the IEC-104 link is tested if there is no other ac-
tivity. The recommended value depends on the
criticality of the link. The IEC-104 standard sug-
gests 20 seconds but for pay-per-use GPRS con-
nections the practical value may be substantially
longer.
Answer to test frame activation if the 101 link is
in the suspended state.
This defines the time in seconds how long a con-
nected IEC-104 link can be in suspended state
(STOPD) before the device closes the connec-
tion. Using this parameter increases the proba-
IEC-104 application settings
Value range
1...3
1...20
1...20
1...255
1...255
1...65000
No, Yes
1...65000
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