EL2252 - Introduction
2 channel digital output terminal with time stamp
The EL2252 digital output terminal connects the binary control signals from the automation device on to the actuators at the process level with electrical isolation. This terminal benefits from very small output delay and is therefore suitable for signals requiring particularly fast output. The EtherCAT terminal supports distributed clocks, i.e. the output data can be monitored synchronous with other data from terminals with distributed clock support. The accuracy across the system is <<1 µs. The EtherCAT terminal has a push-pull output that enables the output to be connected actively to 24 V, 0 V or high-resistance. The EL2252 contains 2 channels, the signal state of which is indicated via LEDs.
The time when the EL2252 switches its outputs must be specified. The time is transferred as process data into the terminal and activated through a bit sequence. The terminal then waits without further user input until the switching event occurs. The specified time is based on the distributed clock time in ns from 1 January 2000, 00:00 hours. During each EtherCAT cycle only one switching event can occur in the EL2252.