On the technical sheet of a motor controller integrating two BTS7960B (picture below), the description of the 8 PINs on the board is as follows:
RPWM: Forward level or PWM signal input, active HIGH
LPWM: Reverse level or PWM signal input, active HIGH
R_EN: Forward drive enable input, HIGH enable, LOW Close
L_EN: Reverse drive enable input, HIGH enable, LOW Close
R_IS: Forward drive - side current alarm output
L_IS: Reverse drive - side current alarm output
VCC: 5V power input
I tried to search for "side current alarm" and "side current" but all I found was about "high/low-side current sensing". Being a newbie in electronics, I'm not sure what is the connection between all those terms.
What is a "side current alarm"? How is it used?