Parameters accessible with Function Code 03, 06,10h
Variables
Revision 13 HC900 Process Controller Communications User Guide 55
April 2017
6.6 Variables
Summary
Variables (analog or digital) are writeable parameters in HC900 attached to input pins of function blocks.
Digital Variable status is also represented in floating point: 0.0 for OFF or logic 0 and 1.0 for ON or logic
1. The Variable number in the table corresponds to the Variable number in the HC900 configuration.
You will need to access the HC900 Process Control Designer configuration or corresponding configuration
printout of Tag Information Report to identify the Variable numbers desired.
Single byte writes are permitted to digital variables. A non-zero will automatically set the digital variable to
a floating point 1 and a zero write to a single register will set the digital variable to 0.
Function Code Support:
Read – Function Code 3
Write – Function Codes 6 (digital variables only), 16 (10 Hex)
The addresses given in Table 6-5 do not necessarily apply to variables in the custom map. For custom
addresses view or print a report in HC Designer.
Table 6-5 Variables
Floating Point in Engineering Units.
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