Siemens Corporation; www.usa.siemens.com
Technology Sourcebook
Failsafe controllers
Siemens Simatic ET 200SP failsafe controllers have 3 integrated Ethernet ports; they can be expanded with a maximum of 64 I/O modules. The controllers handle standard and failsafe distributed applications requiring downstream, local discrete control for up to 128 IO devices. The controllers offer password protection against unauthorized reading out and modification of program blocks.