Application blocks in the drive environment

In addition to general safety functions such as monitoring of safety gates, emergency off/emergency stop function or light curtain evaluation, configurable safety relays also offer special expansion modules and specific application blocks for advanced options such as the safe detection of movement and standstill on drives. Two axes are possible per expansion module, each with eight limit values for speed monitoring, standstill monitoring and detection of clockwise and anti-clockwise rotation. In this way, motion information can be integrated directly into the safety system, irrespective of the drive system you are using.

With normal standard encoders, monitoring is possible up to Category 3 of EN 954-1 or Performance Level d of EN ISO 13849. This is significant for two reasons: fi rstly, there is no need for expensive, safe encoders and secondly, laborious wiring is no longer necessary thanks to the simple “listening function” of the encoder signals – “tapping” the encoder cable via a T-junction. The direct signal tap on the motor encoder minimises the work
involved in the mechanical and electrical design through appropriate adapter cable for the widest range of drives. In the simplest way possible, speed and standstill detection, including evaluation via customized application blocks, is available via plug and play.