Red Lion DLC - Manual (Page 16)

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STEP 19 SCRATCH PAD MEMORY
The Scratch Pad category can be used to read or write to the Scratch Pad memory locations (41101-
41116). The Scratch Pad locations can be used to store user information.
Data Format: Allows registers to be viewed in decimal or hexadecimal format.
Upload: The Upload button causes SFDLC software to read the Scratch Pad registers from the controller.
Download: The Download button causes SFDLC software to write to the Scratch Pad registers in the
controller.
Note: Downloading new values to the controller Scratch Pad locations overwrites the information that is
currently stored in those registers.
Defaults: For this category, there are no controller factory defaults. The defaults for this category are only
SFDLC software basic default values.
STEP 20 VIEW REGISTERS
The View Registers category can be used as a method of diagnostics. Use the DLC Register Table as a
reference of register assignments and data.
First Register: This specifies the first register to be read in a block.
# of Registers: This is the length of the block to be read. The controller supports block read and write
commands up to 32 registers in length. The SFDLC software only allows 16 to be read in a block.
Data Format: Allows registers to be viewed in decimal or hexadecimal format.
Read: Clicking the Read button causes SFDLC software to read the selected registers from the controller.
Write: Clicking the Write button causes SFDLC software to write the selected registers to the controller.
Note: The Write button overwrites the existing register values, and may change the module setup and
operation.
Defaults: For this category, there are no controller factory defaults. By clicking Defaults, the present
entries from the other SFDLC software category screens will be displayed.
STEP 21 CALIBRATION
The DLC is fully calibrated from the factory. Recalibration is recommended every two years. Each channel is calibrated separately. All calibration settings
are stored in the non-volatile memory. Calibration may be performed by using SFDLC software or MODBUS commands. When using SFDLC for calibration,
connect the signal or measuring source to the proper DLC terminals, verify the input or output jumper positions, select the type of calibration to be performed,
and click the Calibrate button. Follow the calibration procedures in the software.
Note: Allow the DLC to warm up for 30 minutes minimum and follow the manufacturer’s warm-up recommendations for the calibration source.
INPUT CALIBRATION
When calibrating the input, the millivolt calibration must be performed first. All other input types use the
millivolt points. Each input range (non-thermocouple) also has its own internal references that are recalled
when the range is selected. Non-used types need not be calibrated.
Calibration Type: This specifies the type of calibration to be performed.
Millivolt: Millivolt calibration requires a precision voltage source with an accuracy of 0.03% or better.
It is used for thermocouple inputs and as a basis for all other input calibration types.
RTD: RTD calibration requires a 0.1% (or better) precision 277.0 ohm resistor.
Process Voltage: Process calibration requires a precision signal source with an accuracy of 0.03% (or
better) that is capable of generating 10.00 V.
Process Current: Process current calibration requires a precision signal source with an accuracy of
0.03% (or better) that is capable of generating 20.00 mA.
Cold Junction: Cold Junction calibration requires a thermocouple of known accuracy of types T, E, J, K, C or N only and a calibrated external reference
thermocouple probe.
TC Type: This selects the type of TC that is being used to calibrate the cold junction.
Scale: This selects the scale in which the Thermometer temperature is entered and the controller temperature is displayed.
Thermometer: Enter the reference thermometer temperature here.
DLC: This displays the DLC process temperature value after a cold junction calibration is completed to verify the accuracy.
Calibrate: The Calibrate button initiates the calibration process after the appropriate settings are selected.