201.028 REV 1 Date of Issue: 18 June 2018
Figure 6.25
Selecting a machine interface fixes the output for the machine connector, for example selecting CANbus means
that you can no longer use the machine connector to communicate in Modbus (the default). If you wish to change
back or to a version of 4-20mA then you have to connect to the CMS via the Remote Connector.
See section 6.4 for information on how to communicate with the CMS in the different protocols.
6.3.3.9 Alarms
The CMS has two switched "alarm" outputs that can be used to signal external equipment in various ways,
according to the test results and the alarm settings. There is also a multi- colour front panel light which indicates
how the result compares to the set alarm thresholds.
The alarm settings are comprehensive and flexible, allowing the CMS to be used in many different scenarios.
6.3.3.9.1 Alarm Levels
The various alarm thresholds are set in the Contamination Code Target / Alarm Levels area of the dialogue.
Alarms can be set on combinations of cleanliness codes, water content and temperature. The available codes, and
their interpretation, vary according to the set test Format. For example it is possible to set a threshold of "NAS
11" or "ISO 18/16/15" or "AS4059E 8B-F", etc.
In general there are upper and lower limits that can be set for the cleanliness level, also for water content and
temperature if applicable. An alarm, if enabled, will become active if any of the associated (upper/lower) limits
are exceeded. However if a field is left empty (blank) this is interpreted as a "don’t care" setting.
In the example Figure 6.21 the Upper Alarm is exceeded if the 4μm count is greater than ISO code 23, or the 6μm
greater than ISO code 22, or the 14μm count greater than code 18, or the water content is greater than 80% RH,
or the temperature is greater than 65°C. The lower alarm is never triggered since all the settings are empty.
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