EL2212 - Introduction

2 channel digital output terminal 24 .. 72 V DC with overexcitation and time stamp

The EL2212 digital output terminal connects the binary control signals from the automation device on to the actuators at the process level with electrical isolation. It also supports the multi-time stamp procedure from FW04 – in addition, multi-time stamp allows the individual output per EtherCAT cycle of as many events as were pre-loaded in the internal buffer.

It is suitable for actuators, e.g. valves or relays with particularly fast switching requirements. For this purpose the terminal is supplied with a higher operating voltage than the rated voltage of the actuator. At the moment of switch-on, this voltage is relayed for a few milliseconds to the actuator, where it ensures dynamic switching due to the correspondingly higher load current. In accordance with the settings it then automatically switches to a current regulating PWM mode, lowers the holding current and thereby reduces the power dissipation in particular. The switching off of the load and hence the mechanical reverse movement is considerably accelerated by the active pole reversal of the operating voltage. The entire dynamics of the switching procedure are parameterized in the CoE of the terminal. Switch-on/switch-off is controlled via the process data.
In addition, pulsating operation of the actuator is possible with a higher-level on/off controller - the so-called "external PWM" - in order, for example, to avoid permanent ON switching (slow drive protection).

The EL2212 can be operated as a normal 2-channel output terminal; i.e. it switches after receiving the process data. As a further mode of operation, the terminal can also be operated with Distributed Clocks and timestamp function like the EL2252 and in this case it switches the outputs with the nanosecond precision of Distributed Clocks independently of the bus cycle. This makes chronologically synchronous cooperation possible with other terminals in the Distributed Clocks system.

The EL2212 contains two channels, the signal state of which is indicated via LEDs.

The EL9150 can be used as supply terminal for a supply voltage of >24V.