ABB COM600 3.4 User Manual page 26

26
Station Automation COM600 3.4
IEC 60870-5-101 Master (OPC) User's Manual
Property / Para- Value or Value range/ Default
meter
Carrier Blocking Carrier detect signal is ignored
Carrier detect signal must be
set
Default: Carrier detect signal
must be set
CTS Delay 0...65535
Default: 0
Enquiry Limit 0...255
Default: 3
Header Timeout 0...65535
Default: 2000
Link Type RTS activated during transmis-
sion (Unbalanced slave)
Poll for One Device True
on One Link
False
Default: False
Polling of Com- True
manded device
False
Default: False
Polling when DFC True
Bit Active
False
Default: False
Description
This attribute determines whether the
Carrier Detect signal of the serial port must
be set for the IEC station to receive mes-
sages.
Delay in milliseconds between activation
of the RTS signal and start of new trans-
mission.
Specifies maximum number of times that
a message is retransmitted after timeout.
Maximum waiting time in milliseconds of
a link layer response.
The type of data link connection used on
the line.
When this is set to true, the master infin-
itely polls the first link that responds. Only
the device from which the first data is
received is set to OK status and in case
of communication failure, only this device
is set to suspended state. This configura-
tion is especially useful in a multistation
configuration with dial-up, in which the
device makes the call and there is only
device behind the link. When this is set to
false, all the links are polled normally.
Polling of the commanded device. When
this is set to true, the commanded device
is always polled with the number of data
polls defined with the Reply Poll Count.
Both class 1 and class 2 polls are done.
With this configuration, too big value in the
Reply Poll Count can cause inefficiency
in polling. When this is set to false, the
commanded station is polled with the
number of data polls defined with the
Reply Poll Count only if the device
requests for class 1 polling.
The polling method when a remote station
sets the DFC bit on. When this is set to
false, the master sends the 'request status
of link' until the remote station clears the
DFC bit. When this is set to true, the
master polls normally.
1MRS756703