PSM Logic Functions, Hysteresis Block Function - GF54.21-D-3208TSB

Model 447, 448 

with code ED5 (Parameterisable special module) 

with code XM7 (MOPF II) 

Model 907, 910 

with code ED5 (Parameterisable special module) 

with code XJ4 (Modification year G4-I) 

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) (PSo)

No behavior is defined for lower threshold parameter (low) (P_Su ) > upper threshold parameter (high) (P_So ).

Signal identification number = Signal ID.

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) (PSU )
B1_G1_HB1_Threshold_high	16 bit	-	Upper threshold parameter (high) (PSo )

Designation in signal ID list	Data bit width	Meaning
SPS_G1_HB	1 bit	Signal ID for output (AA )
SPS_G1_HB_inv	1 bit	Signal ID for inverted output (AB )

The same applies for the other hysteresis blocks taking the naming conventions into account:

• "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"

Overview of system components for parameterizable special module (PSM)

GF54.21-D-9998TSB