Chapter Three: Overview
System Design Elements
95
Memory Storage in the 146 Instrument
The operational parameters of the 146 unit are stored in non-volatile memory as parameters are
changed. The 146 unit is designed to store most user-defined, and 146-determined data in
EEPROM. A front-panel lockout command, however, is not stored. The following is a list of
what is preserved in EEPROM.
Data Stored in EEPROM During Power Loss
Power Down Status Data
Alarm Data (for all alarms)
Alarm information
State (enabled or disabled)
Recipe
Control mode
Channel state (on/off)
Trip point value
Associated channel number
Untripped state (actuated or deactuated)
Control Data
Recipe Data (for each recipe)
Softstart value
Base value
Alpha value
Start value
Polarity setting
Preset value
Integral value
Set point value
Softstart state (enabled
or disabled
Gain
Input Channel number
Lead
Analog set point range
Analog set point state (enabled or disabled)
Channel-Sensor Data (for all channels)
Linear Capacitance Manometer:
Zero
Pirani-type:
Gas type
Zero (if enabled)
MFC:
Co-channel
Mode
Hot Cathode:
Ion gauge factor
Disconnect threshold
High pressure shutoff
Fast Rate-of-Rise state (enabled or disabled)
Sensitivity
Cold Cathode:
Disconnect threshold
Combined gauge and GCF
Table 37: Data Stored in EEPROM During a Power Loss
(Continued on next page)
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