Siemens SINUMERIK Series Function Manual page 26

Overview of Safety Integrated functions
2.1 Supported functions
– Safe Brake Test (SBT)
– Safety Control Channel (SCC)
– Safety Info Channel (SIC)
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The "Safe Brake Test" function (SBT) checks the required holding torque of a brake
(operational or holding brake). This function is in conformance with SIL 1 according to
IEC 61508 and to PLd/Cat. 2 according to EN ISO 13849‑1.
Control information (S_STW1B and S_STW3B) can be transferred from the higher-level
control system to the safety functions of the drive using the Safety Control Channel
(SCC).
Status information of the Safety Integrated functionality of the drive (S_ZSW1B,
S_ZSW2B, S_ZSW3B and S_V_LIMIT_B) can be transferred to the higher-level control
system using the Safety Info Channel (SIC).
Function Manual, 10/2015, 6FC5397-3EP40-5BA3
Safety Integrated