Chapter 3 – Communications
TestEquity F4T Controller Page 15
Common Modbus Registers
F4T Mode
The following registers are applicable in the F4T Mode (Data Map 1). These are the most
common registers that would need to be used in an automation environment. Some of these
registers are different from F4T controllers that do not have Cascade Control.
Some F4T parameters are contained within 32 bits (IEEE Float). Notice that only one (low order)
of the two registers is listed. By default, the low order word contains the two low bytes of the 32-
bit parameter. As an example, in the table below see Actual Air Temperature. Note that it lists
register 4182. Because this parameter is a float, it is represented by registers 4182 (low order
bytes) and 4183 (high order bytes).
Parameter Name Register Data Type and Access (Read or Write)
Temperature Set Point 4042 IEEE Float RW
Closed Loop Set Point* 4190 IEEE Float R
Target Set Point** 16602 IEEE Float R
Actual Part Temperature (PV) 4180 IEEE Float R
Actual Air Temperature (PV) 4182 IEEE Float R
Simple Set Point 4200 16-bit RW Off = 62, On = 63
(Disables Cascade Control)
Event 1 16594 16-bit RW
Event 2 16596 16-bit RW
Event 3 16598 16-bit RW
Event 4 16600 16-bit RW
Event 5 16822 16-bit RW
Event 6 16824 16-bit RW
Event 7 16826 16-bit RW
Events 1-7 Off = 62, On = 63
* Instantaneous Set Point during a ramp or profile
** Set Point target during a ramp or profile
Manual Ramp Parameters (Ramp to Set Point without a profile)
The manual ramp parameters are all 16-bit RW.
Ramp Action 4054
Off = 62
Startup = 88
Set Point = 85
Both = 13
Ramp Scale 2956
°/Minutes = 57
°/Hours = 39
Ramp Rate 4058
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