Allen-Bradley 825-P - Page 140

140 Rockwell Automation Publication 825-UM004D-EN-P - November 2012
Chapter 10 Modbus RTU Communications
Table 75 - 60h Read Parameter Descriptor Field Definition
The Parameter Conversion field is defined in Table 76:
Table 76 - 60h Read Parameter Conversion Field Definition
Calculate the actual (not scaled) value of the parameter (setting) using Equation 2:
Bit Name Description
0 RO: Read-only 1 when the setting is read-only
1 H: Hidden 1 when the setting is hidden
2 DBL: 32-bit 1 when the following setting is a fractional value of this setting
3 RA: RAM-only 1 when the setting is not saved in nonvolatile memory
4 RR: Read-only if running 1 when the setting is read-only if in running/operational state
5 P: Power Cycle or Reset 1 when the setting change requires a power cycle or reset
6 0 Reserved
7 Extend Reserved to extend the descriptor table
Conversion
Value
Type Multiplier Divisor Offset Base
0 Boolean 1 1 0 1
1 Unsigned Integer 1 1 0 1
2 Unsigned Integer 1 10 0 1
3 Unsigned Integer 1 100 0 1
4 Unsigned Integer 1 1000 0 1
5 Hexidecimal 1 1 0 1
6 Integer 1 1 0 1
7 Integer 1 10 0 1
8 Integer 1 100 0 1
9 Integer 1 1000 0 1
10 Enumeration 1 1 0 1
11 Bit Enumeration 1 1 0 1
value =
Calculate the scaled setting value using Equation 2:
(Parameter Value + Oset) • Multiplier • Base
Divisor
value = – Oset
value • Divisor
Multiplier • Base
Equation 1
Equation 2