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Memory details, DPIA PD 600 DPI series device is equipped with 2 different memory types, with different characteristics. These memory types are described in the following.
The RAM memory is battery backed, and is used for static and temporary local and global Process-Pascal variables and the Process-Pascal stack. Data in RAM is preserved after a power failure, but not after a master reset of the device.
The FLASH memory can be reprogrammed 100000 times. The Program FLASH memory is used for Process-Pascal programs. The Data FLASH memory is used for static, global Process-Pascal variables, which are not changed very often. The FLASH memory is organized into 2 Kbytes blocks. Storing in FLASH memory will take minimum 0.5 ms pr. word. Data in FLASH is preserved, even after applying a master reset to the device. Refer to UserFLASH for further information on how to use FLASH memory for Process-Pascal variables.
LED indicatorsA PD 600 DPI series device is equipped with 2 LED indicators, “Error” (red) and “On” (green).
Version 1 operating systemThe state of the device is indicated by the LEDs, according to the scheme shown in the table.
Power supply voltage too low occurs when the power supply voltage is below approx. 18 V and MaxPowerdownTime is <> 0. A behaviour similar to the symptoms of Power supply voltage too low also occurs if the ripple percentage exceeds the maximum value of 5%. Refer to Electrical Specifications.
Version 2 operating systemThe state of the device is indicated by the LEDs, according to the scheme shown in the table below.
Ref. 1 Both LEDs are OFF when the device is not powered.
Ref. 2 This indication means that the RAM preserve facility introduced in version 2.10 is enabled, but the BOOT OS is too old to support it. The Boot OS must be at least version 2.09. Please note, that devices running Boot OS 1.xx can’t be updated to version 2.xx.
Ref. 3 and 4 When the red LED is OFF, the device is OK. The green LED indicates if Process-Pascal is running or not.
Ref. 5 and 6 The fast blinking red LED indicates, that the device has performed a MasterReset. The green LED indicates if Process-Pascal is running or not. MasterReset occurs, when the reset button is pressed for 10 seconds or more, or when a device with no working battery is powered down. The MasterReset indication is cleared by pressing the reset button for less than 10 seconds, resetting the device by writing 255 to Service.Reset, or downloading a new Process-Pascal program.
Ref. 7 This indication means, that the device is defective. Neither operating system nor Process-Pascal is running.
Ref. 8 and 9 This indication means, that the device is defective, but the operating system is running. The green LED indicates if Process-Pascal is running or not. One of the following situations has occured:
Real time clock, Backup batteryA PD 600 DPI series device is equipped with a replaceable lithium battery for real time clock and RAM backup. The battery is not rechargeable. If the device is constantly powered, the lifetime of the battery is approx. 7 years. If the device is constantly un-powered, the lifetime of the battery is approx. 3 years. Refer to BatteryState for further details on the built-in battery.
The devices are equipped with a real time clock circuit with battery backup. Max. deviation is approx. 3 minutes per month over the full temperature range, and approx. 1 minute per month at 25 degrees Centigrade. The same circuitry is used for the Process-Pascal timer system, ensuring that the real time clock and the Process-Pascal timers are synchronized.
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