ASE2000 V2 Communication Test Set User Manual 188
28.2. IEC 60870-5 – Fields
Name is used to identify the exchange on the Line Monitoring and Messages views. This îš¿eld is
normally not modied since default names reect exchange functionality. In some cases, a user
may create two similar exchanges, in which case the name can be changed for di󰀨erentiation.
For example, one Single Point exchange may be used for points 100 to 109, while a second
might be for points 110 to 119, in which case names such as Single Point 100-109 and Single
Point 110-119 might be meaningful. The name is not used by ASE2000 internal processing.
Frequency deîš¿nes how often a message is to be transmitted (in seconds). It is applicable in
Master Simulation Mode when communication is started with the Send Continuous or Start
button, and in RTU Simulation Mode. It is not applicable in Line Monitoring Mode.
When Send Continuous is selected, the selected exchange message is sent immediately and,
thereafter, at regular intervals speciîš¿ed by the Frequency.
When Start is selected in Master Simulation mode, each exchange with its Transmit ag set is
transmitted at the associated frequency. The îš¿rst transmission occurs at the frequency interval
after Start, with subsequent transmissions periodically thereafter. For example, if two exchanges
both have the Transmit ag set, one with a frequency of 2.0 seconds and another with 3.0
seconds, the îš¿rst exchange is sent 2 seconds after Start is pressed and every 2 seconds
thereafter. The second exchange is sent 3 seconds after Start is pressed and every 3 seconds
thereafter.
A special frequency value of 0 seconds (along with setting the Transmit ag) causes the exchange
to be sent once immediately after Start is pressed. This is typically used with the STARTDT
ACT exchange for IEC 60870-5-104 protocol, and also commonly used with the Interrogation
exchange for both IEC 60870-5-101 and IEC 60870-5-104.
Note that frequency settings deîš¿ne the desired transmission rate. An exchange is never sent
before processing of the prior exchange has terminated, either because the entire response has
not yet been received or because no response has been received and the response timeout
period has not yet expired.
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For IEC 60870-5-101 protocol in master simulation mode, the ASE2000 normally sends
Class 1 and Class 2 requests in addition to the exchanges manually conîš¿gured for
transmission. These exchanges do not have to be explicitly enabled. Please see the
Properties tab section for more discussion.
In RTU Simulation mode, frequency deîš¿nes how often information objects are queued for
transmission. For example, if a Single Point exchange is conîš¿gured for transmission
2
with a 10
second frequency, then it is inserted into the Class 2 response queue every 10 seconds. After
insertion, it is sent based on its queue position.
DisplayandEventags are as dened in the main ASE200 document. There is no special
meaning for IEC protocols.
Transmitag causes a message to be transmitted according to rules discussed for the frequency
setting, above. For Master Simulation for IEC 60870-5-104 protocol, it is important that the
STARTDT message be enabled for transmission at a 0.0 second frequency.
2 For 101, in response to Class 1 and Class 2 requests; for 104, automatically.
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