INFICON HPG400-SD ATM to Ultra-High Vacuum Gauge (DeviceNet) - Manual (Page 12)

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tira03e1-b (0310) BPG/HPG400-SDv1.cp
A single byte attribute whose value indicates the status of the alarms and warnings
for the device. The device supports the Expanded Mode.
For the Expanded Mode, bit seven of Exception Status attribute is set to one;
exceptions are reported through the communication of this Exception Status at-
tribute, formatted as specified in the table below. In addition, the Exception Detail
attributes are supported. The Exception Status bits are determined by a logical
”OR” of the related Exception Detail bits, as indicated.
Bit Function
0 ALARM/device-common
(The alarm or warning is not specific to the device type or device type
manufacturer.)
1 ALARM/device-specific
2 ALARM/manufacturer-specific
3 reserved, set to 0
4 WARNING/device-common
5 WARNING/device-specific
6 WARNING/manufacturer-specific
7 1 Expanded Method
The formats of these two attributes are identical. Therefore, they are described
together:
Attributes that relate the detailed status of the alarms or warnings associated with
the device. Each attribute is a structure containing three members; these three
members, respectively relate the detailed status of exceptions that are common
(i.e., not device-specific), device-specific but not manufacturer-specific, and
manufacturer-specific. The common and device-specific detail are defined below. A
manufacturer-specific detail has a length of 1 byte. A SIZE value of one indicates
that one byte detail is defined for the associated exception detail structure.
Each of the three structure members is defined as a structure containing an or-
dered list (i.e., array) of bytes of length SIZE, and an unsigned integer whose value
is SIZE. Each of the bytes in each array has a specific mapping. This mapping is
formatted as 8 bits representing 8 independent conditions, whereas a value of 1
indicates that the condition is set (or present), and a value of 0 indicates that the
condition is cleared (or not present). Note that if a device does not support an
exception detail, the corresponding bit is never set. The bitmaps for alarms and
warnings in the corresponding attributes are structured in parallel so that a condi-
tion may have either alarm or warning set depending on severity. If a condition
inherently cannot be both alarm and warning, then the parallel bit position corre-
sponding to the other state will remain "0".
This structure relates exception conditions (i.e., alarms or warnings) which are
common to all devices within the Hierarchy of Semiconductor Equipment Devices.
The Detail element of the structure is an ordered list (i.e., array) of bytes of length
[SIZE=2] which is the value of the structure element Size. For each byte in the
Detail field, all bits which are not identified are reserved for future standardization.
Two bytes Common Exception Detail are provided: Common Exception Detail[0]
and Common Exception Detail[1]. The specific exception associated with each of
the bitmaps is given in the table below. The SIZE for this revision is two (2).
Exception Status
Exception Status Bit Map
Exception Detail Alarm and
Exception Detail Warning
Common Exception Detail