IEC 61131-6:2012规定了第1部分中定义的可编程控制器（PLC）及其相关外围设备的要求，这些设备拟用作电气/电子/可编程电子（E/E/PE）安全相关系统的逻辑子系统。符合本部分要求的可编程控制器及其相关外围设备被认为适用于E/E/PE安全相关系统，并被识别为功能安全可编程逻辑控制器（FS-PLC）。FS-PLC通常是硬件（HW）/软件（SW）子系统。FS-PLC还可以包括软件元素，例如预定义的功能块。

IEC 61131-6:2012 specifies requirements for programmable controllers (PLCs) and their associated peripherals, as defined in Part 1, which are intended to be used as the logic subsystem of an electrical/electronic/programmable electronic (E/E/PE) safety-related system. A programmable controller and its associated peripherals complying with the requirements of this part is considered suitable for use in an E/E/PE safety-related system and is identified as a functional safety programmable logic controller (FS-PLC). An FS-PLC is generally a hardware (HW) / software (SW) subsystem. An FS-PLC may also include software elements, for example predefined function blocks.