Spectrum Controls 140 EHC 204 00sc - Manual (Page 33)

Quantum Series 140 EHC 204 00sc 140 EHC 208 00sc
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Due to the limited register availability of the Quantum Platform, the scale and limit factors are
multiplexed onto register 4X+1. Changing these values will generally occur either at power-up or
line changeover. On power up, scale factors default to the values stored in EEPROM and the count
limit values (preset, count limit, and rate limit) default to zero.
These values can be altered during operation, but if the new power up default values are de-
sired, the values must be programmed into the EEPROM by using the Programm EEPROM setting,
Bit 2.
Not Used - Bit 9
Channel Number for scale/limit word: Bits 6-8
These bits are used to specify the channel to which the scaling values will be applied. It is
critical that these are set along with the Parameter Definition settings, Bits 11-13 in order to program
the proper scale factors to a particular channel.
Not Used : Bits 4-5
Disable Scaling : Bit 3
Asserting this bit disables the K, M, and R scaling factors without effecting the limit words
(preset, count limit, and rate limit).
Program EEPROM : Bit 2
Asserting this bit places the parameter that is currently in to 4x+1 register into EEPROM. After
the value has been programmed the module will retain the value even if power is removed. It is
recommended that you programm all scaling factors first and then write them to EERPROM. This is
faster and will prolong the life of the EEPROM.
Enable Scale/Limit Word: Bit 1
Asserting this bit enables register 4X+1. The value in register 4X+1 is defined by the Channel
Number bits and the Parameter Definition bits.
If the customer desires to update the K, M, R, Preset, count limit, or rate limit values the enable
scale/limit word bit must be set. The default values for all of these scaling and limit words is ini-
tially 0. Programming these values in EEPROM so that the values will need to be stored only once.
The module will retain these values even if power is removed.
Layout for 4X+1 Register
The 4X+1 register is used to set the Preset, count limit, Rate Limit, M scale factor, K scale
factor, and R scale factor for each channel as explained in Table X Module Configuration Word
(4X+0 Registers). These scale factors are explained as follows: