PCC-IV Instruction Manual (rev. 0.1)
Page 4-11
Section 4
–
Menu Operations
Memory Menu
This screen displays pertinent information relating to what is currently loaded in the
PCC-IV.
•
Config file name: This is the name of the file written by the Blockware
designer.
•
Config Written: The date the config file was written.
•
Blockware Version: The Block Function Library version used to create this
logic
•
M4 core firmware version: The M4 core executes the blockware logic.
•
A5 core firmware version: The A5 core executes the screen and
communications software.
•
Block (average) Idle Time (ms): The PCC-IV executes all its blocks in 100
ms (10 times per second). If it scans every block in the blockware in less
than 100 ms (Scan Time), it fills the remaining time with a delay loop. This
is the Block Idle Time. In the unlikely event that the scan time is >100 ms,
the PCC-IV will always complete the execution of all blocks.
Save Config Changes:
Data changes that are made during the use of the Browse Blocks, Calibrate I/O, and Modbus Ports menus are
saved in the non-volatile, redundant, NVRAM. While very unlikely, both NVRAM
’s could be corrupted. After making
any changes, the user SHOULD “Save Config Changes” into the separate EEPROM memory via the Utilities >>
Memory Submenu. This creates a third redundant backup of any changes made by the user.
Pressing this soft-button will copy any changes you made to the Parameters via Browse Blocks, to Calibration data
via Calibrate I/O, and to Communication data via Modbus Ports from NVRAM to EEPROM memory.
Calibrate I/O Menu
This menu item allows the user to calibrate the Analog Inputs (0-5 Vdc) and the
Analog Outputs (4-20 mA). All PCC-IV controller Analog Inputs and Analog Outputs
are factory calibrated per the chart below.
Board Type:
Input or Output
Factory Calibration Tolerance
All
Input
+/-0.001 V or 0.025% of 4 V
All
Output
+/-0.003 mA or 0.019% of 16 mA
When is Calibration Required?
Typically, a PCC-IV will not require field calibration for the life of the controller. There
are two reasons to field calibrate all or part of the PCC-IV: An Option Board is installed
in the field, or the factory calibration data is corrupted.
Option board installed in the field: Because factory calibration data is not in the CPU
board EEPROM memory, the PCC-IV uses default calibration data to allow operating the new option board without
factory calibration data. The default data reduces the guaranteed accuracy as shown below. If this accuracy is
acceptable, the new Option Board does not have to be calibrated.
Board Type:
Input or Output
Worst Case Accuracy when using
Default Calibration Data
CPU, A, F, or G
Input
+/-10 mV or 0.25% of 4 V
B
Input
+/-50 mV or 1.25% of 4 V
CPU or F
Output
+/-0.05 mA or 0.3% of 16 mA
NOTE: This chart only applies to field installed Option Boards that have
NOT been calibrated. Factory installed Option Boards are calibrated as
noted above.
The above chart reflects theoretical, worst case accuracy data. Typically, the default data provides much higher
accuracy than the chart shows. Input voltage accuracy can be checked by measuring the input voltage, converting
it to a percentage (based on
AIN
Block scaling), and comparing the result to the
AIN
Block Output value as shown
by the Browse Blocks menu item. Output accuracy can be checked by putting the Output into S/M mode and
comparing the measured mA output to the percentage displayed by the Browse Blocks menu item.
