Hot/Cold

Description

This function is useful if two opposing actuators are used to cover the whole range of the adjustment spectrum. It is placed downstream from the Loop Controller.

The Hot/Cold function also includes the following operating processes:

It manages overlaps as well as dead bandwidths between the two actuators.
Manual command and a manual order (consistent with a single PID) can be used.

The Hot/Cold function is used to manage analog outputs as well as servo drives with copy. It does not allow managing servo drives without copy.

When using this function, you must set the loop controller output scale on (0, 100).

Function Parameters

Function parameters define the characteristics of each actuator, that is to say the manner in which both vary between both thresholds.

The output value varies in a linear fashion. Outside the two thresholds, the output is limited to the preset thresholds.

Output 1 manages the "cold," while Output 2 manages the "heat."

Function Parameters

Input Parameter:

Parameter	Symbol	Type	Thresholds	Default Value	R/W
Command Value	OUT_MAN	Floating	0.0 / 100.0	/	R/W

Internal Parameters:

Parameter	Symbol	Type	Thresholds	Default Value	R/W
Value of OUT1 for OUT_MAN = OUT1_TH1	OUT1_INF	REAL	-3.4E38 / 3.4E38	0.0	R/W
Value of OUT1 for OUT_MAN = OUT1_TH2	OUT1_SUP	REAL	-3.4E38 / 3.4E38	100.0	R/W
Value of OUT2 for OUT_MAN = OUT2_TH1	OUT2_INF	REAL	-3.4E38 / 3.4E38	0.0	R/W
Value of OUT2 for OUT_MAN = OUT2_TH2	OUT2_SUP	REAL	-3.4E38 / 3.4E38	100.0	R/W
Input value for which OUT1 = OUT1_INF	OUT1_TH1	REAL	0.0 / 100.0	50.0	R/W
Input value for which OUT1 = OUT1_SUP	OUT1_TH2	REAL	0.0 / 100.0	0.0	R/W
Input value for which OUT2 = OUT2_INF	OUT2_TH1	REAL	0.0 / 100.0	50.0	R/W
Input value for which OUT2 = OUT2_INF	OUT2_TH2	REAL	0.0 / 100.0	100.0	R/W

Output Parameters:

Parameter	Symbol	Type	Thresholds	Default Value	R/W
Limiting the output 1 variation in %/s	OUTRATE	REAL	0.0 / 3.4E38	0.0	R/W
Limiting the output 2 variation in %/s	OUTRATE2	REAL	0.0 / 3.4E38	0.0	R/W

Execution Monitoring

The system indicates a processing error in the following cases:

A non-integer input data item is detected on one of the parameters.
A problem arises in a calculation in floating point mode.

In any case, the error is considered to be critical. The loop output is frozen, while errors are signaled in the status words. An error (warning) is also displayed if the OUT1_TH1, OUT1_TH2, OUT2_TH1 and OUT2_TH2 thresholds do not fall between 0 and 100%.