Why does PLC Coder generate an incorrect testbench for a model with continuous stimulus?

I generate Structured Text for my Function Block using PLC Coder. The simulation results in Simulink look fine, and the generated PLC Code for the Function Block seems to be correct.

However, for the testbench, the input stimulus does not have the number of samples that I expect, and the output vector looks garbled:

tb_In1: ARRAY [0..54] OF SINT := 0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,1,1,1,1,1,1,1,1,1,1,1,1,0,0,0,0,0,0,
        0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0;
tb_Out1: ARRAY [0..54] OF SINT := 1,1,1,1,2,2,1,1,1,1,1,-45,2,0,0,0,0,0,0,0,2,0,0,0,90,55,-39,99,-14,0,0,-120,
        -80,83,-31,10,0,0,0,0,1,0,0,0,1,0,0,0,16,-77,28,39,0,0,0;

Instead, I expected:

tb_In1: ARRAY [0..10] OF SINT := 0,0,0,0,1,1,0,0,0,0,0;
tb_Out1: ARRAY [0..10] OF SINT := 1,1,1,1,2,2,1,1,1,1,1;

Why is this?

Answer 1

[MathWorks Support Team]

This issue may arise if the discrete Function Block is fed by a continuous signal.

To work around the issue, discretize your stimulus by specifying a Sample Time in the respective signal source block, or use a Signal Specification block before the Function Block to set a matching sample time for the stimulus.