7BChapter Four: Operation 77BS-Device Supervisor Object
75
Exception Status
Attribute ID #12 reports the type of alarm or warning condition detected by the instrument. The
alarms and warnings are identified as:
• Device Common—specific to the DeviceNet network
• Device Specific—specific to capacitance manometers
• Manufacturer Specific—specific to the MKS unit
The response is a byte structured as a bit mapped variable [3]. The transducer supports the
expanded method of reporting exceptions. The bit map format is:
7 6 5 4 3 2 1 0
Table 44 lists the bit map defining this variable.
Table 44: Exception Status Bit Map
Bit Definition
0 (0/1) Alarm/device-common
1 (0/1) Alarm/device-specific
2 (0/1) Alarm/manufacturer-specific
3 0 (Reserved)
4 (0/1) Warning/device-common
5 (0/1) Warning/device-specific
6 (0/1) Warning/manufacturer-specific
7 1 (Expanded Method)
The response returns a binary value with the least significant bit (bit 0) as the last digit. The
response values are additive; therefore, one hex value reports all alarm conditions. For example,
if the unit detects a device-specific alarm condition, the unit reports: 82
hex
= 1 0 0 0 0 0 1 0
Refer also to Table , page 79.
Exception Detail Alarm
Attribute ID #13 identifies the specific alarm
condition(s) detected by
the DMA transducer. This
attribute is a Structure of three Structures containing a bit mapped representation of the alarm
detail. This structure contains a total of 8 bytes. The first group contains 3 bytes representing
Common Exception Detail Alarm Bytes. The second group contains 3 bytes representing Device
Exception Detail Alarm Bytes. The third group contains 2 bytes representing Manufacturer
Exception Detail Alarm Bytes.
The response is a byte with each bit representing a specific exception (alarm) condition, as listed
in Table 46. The bit that is set indicates that the alarm
assigned to that bit is active. The response
returns a binary (hex) value with the least signi
ficant bit (bit 0) as the last digit. The response
values are additive; therefore, one hex value reports all alarm conditions.
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