Spectrum Controls 140 EHC 204 00sc - Manual (Page 40)

Counter / Flow Meter Input Module
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The process for updating the scale coefficients and the count limits is as follows:
1.Set the Scale/Limit Word to its desired value (4x+1 register). This must be performed before updating the
module control word.
2.Set the following bits on the module control word (register 4X+0) to the appropriate state for the value to
be written:
a.Channel Number
b.Parameter Definition
c.Enable Scale/Limit Word (set to 1)
Note: This bit can be set at the same time as the channel number and parameter definition, but not earlier.
3.Read Module Status word (Register 3X+8) and verify the Enable Scale/Limit Word bit is set.
This verifies the module has received the control word update.
4.Set the Enable Scale/Limit Word bit to 0.
5.Update other Scale/Limit values by redoing steps 1 through 7.
To store K, M, and R values into the EEPROM perform the following:
1.Set the Program EEPROM bit (bit 2) in the Control Word (Register 4X+0).
2.Read Module Status word (Register 3X+0) and verify the Program EEPROM Echo(bit 2) is set. This
verifies the module has received the control word update.
3.Verify the Program EEPROM Echo bit has been set in the Module Status Word.
4.Zero the Program EEPROM bit and the Enable Scale/Limit Word bits in the Module Control Word.
Please refer to our website, www.spectrumcontrols.com, for ladder logic samples and technical notes.
Bit Settings for 3X Registers