8 OPC UA ObjectTypes ToC Previous Next

8.3 Monitoring ToC Previous Next

8.3.8 CombinedChannelMonitoringType ToC Previous Next

The CombinedChannelMonitoringType is a subtype of the ChannelMonitoringType and inherits all its InstanceDeclarations. Using this type instead of a ChannelMonitoringType provides an aggregated representation of the channels in a machine tool. The rules for aggregation are given in Table 22. Sometimes it is not necessary to provide one representation per individual channel, e.g. if one channel is of primary interest, the status of the remaining channels is irrelevant for the machine tool status. It could be used together with the separate channels. Typical applications are multi-spindle machines in which a large number of channels are used for interlinked work steps.

Table 22 – Rules for Aggregation of the CombinedChannelMonitoringType

Component of the CombinedChannelMonitoringType Rule for Aggregation
ChannelState Mode of the channel not in “active”, otherwise “active”
- if all channels active –> active
- if >0 channel reset –> reset
- else interrupted
ChannelMode Mode of the channel not in “automatic”, otherwise “automatic”
If one or more channel of the combined channels is not in “automatic” the machine tool is not producing (except if the channel is not currently in use). If for example the operator is in JogManual and moving one axis, the whole machine tool is not producing in automatic and the combined channel can be viewed as in JogManual
FeedOverride selection from HMI mirrored
On most multi spindle machines there is one HMI which controls the whole machine tool, so most of the input is applied to all combined channels
RapidOverride selection from HMI mirrored
On most multi spindle machines there is one HMI which controls the whole machine tool, so most of the input is applied to all combined channels
ChannelModifiers If an element of ChannelModifiers is True in any channel, it has to be True in the combined channel.

The CombinedChannelMonitoringType is formally defined in Table 23.

Table 23 – CombinedChannelMonitoringType Definition

Attribute Value        
BrowseName CombinedChannelMonitoringType        
IsAbstract False        
References Node Class BrowseName DataType TypeDefinition Other
Subtype of the ChannelMonitoringType defined in 8.3.7 i.e. inheriting the InstanceDeclarations of that Node.          

The CombinedChannelMonitoringType contains no further References than the ones inherited.

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