The machine manufacturer can use his PLC user program to close the brake at a
suitable instant in time (nominal value every 8h, see Chapter 1.6.1 ”Information
Sheets of the Employer’s Liability Insurance Association”) and to initiate that the
drive produces an additional force in addition to the weight of the axis. In an error/
faultfree state, the brake can produce the necessary braking torque / the necessary
braking force, i.e. the axis hardly moves.
When an error/fault occurs, the actual position value exits the parameterizable
monitoring window. This prevents an axis from possibly sagging. The function test
of the brake mechanical system is negatively acknowledged

看看原始文档对于安全抱闸测试作用描述，当然不同调试厂家的方式有细微差别，但应该不会脱离其本质。