PSM Logic Functions, Hysteresis Block Function - GF54.21-S-3208TRA

Model 447

With Code ED5 (Parameterisable special module)

Except Code XM7 (MOPF II)

Model 448

With Code ED5 (Parameterisable special module)

Except Code XM7 (MOPF II)

Courtesy of MERCEDES-BENZ USA

Hysteresis block, function, general

The input (E) of the hysteresis block is 16 bits wide. Output (A_A ) and output (A_B ) are digital (binary), whereby output (A_B ) always represents the inversion of output (A_A ).

A codable input filter is connected upstream of the input (E) of the hysteresis block.

Using the hysteresis block, it is possible to, e.g. convert an analog input signal into a digital signal using a threshold switch.

Coding of hysteresis block

The lower threshold parameter (low) (P_SU ) and the upper threshold parameter (high) (P_SO ) can be coded using the data entry table.

Value (W) < Lower threshold parameter (low) (P_SU ) → Output (A_A ) = 0
Value (W) > Upper threshold parameter (high) (P_SO ) → Output (A_A ) = 1
Lower threshold parameter (low) (P_SU ) ← Upper threshold parameter (high) (P_SO )

No behavior is defined for lower threshold parameter (low) (P_SU ) > Upper threshold parameter (high) (P_SO ).

Signal identification number = Signal ID.

CODING VIA DATA ENTRY TABLE

Designation in data entry table	Data entry bit width	Data bit evaluation	Meaning
B1_G1_HB1_Signal_ID	32 bit	16 bit	Filter + signal ID input signal data entry
B1_G1_HB1_Threshold_low	16 bit	-	Lower threshold parameter (low) (P_SU )
B1_G1_HB1_Threshold_High	16 bit	-	Upper threshold parameter (high) (P_SO )

SIGNAL ID OF OUTPUTS

Designation in signal ID list	Data bit width	Meaning
Out_G1_HB	1 bit	Signal ID for output (A_A )
Out_G1_HB_inv	1 bit	Signal ID for inverted output (A_B )

The same applies for the other hysteresis blocks making allowance for the naming convention:

"B<Block number>_G<Group number>_HB<Number>_Signal_ID"
"B<Block number>_G<Group number>_HB<Number>_Threshold_(low, high)"
"Out_G<Group number>_HB<Number>"
"Out_G<Group number>_HB<Number>_inv"

	Parameterizable special module (PSM) control unit component description		GF54.21-S-5005TRA
	Overview of system components for parameterizable special module (PSM)		GF54.21-S-9998TRA