INFICON PSG55x ATM to Medium Vacuum Gauge (DeviceNet) - Manual (Page 17)

tira58e1-a (2012-03) PxG5xx.cp
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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 manu-
facturer-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".
The existence of an exception detail variable structure is dependent on the value of
the Exception Status Attribute; the existence of an exception detail variable
structure is only required if bit seven of the Exception Status attribute is set to 1
(indicating Expanded method reporting) and the bit (among bits zero through six) of
the Exception Status attribute corresponding to the particular exception type is also
set to 1.
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] 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.
The first byte in this attribute is CommonExceptionDetail[0]. Additional exception
details, if provided, are named CommonExceptionDetail[1], …
CommonExceptionDetail[SIZE]. The specific exception associated with each of the
bitmaps is given in the table below. The SIZE for this revision is two (2).
Exception detail alarm and
exception detail warning
(ID 13, ID 14)
Common exception detail