The two technology modules "2 Pulse" and "1 Step" for the distributed peripheral system "Simatic ET 200S“The Siemens Industry Automation division improved its performance and added additional functions. The current output can now be measured and precisely controlled on the two-channel technology module 2 pulses for controlling actuators and valves. A new feature of the 1-channel 2-step stepper motor module for positioning tasks in stepper motors is the motion task to move to a specified position. The two-channel technology module 4 pulses for controlling actuators and valves now also measures the current output in the PWM (pulse width modulation) and pulse chain modes and sends the value back to the CPU. In this way, even simple proportional valves can be connected directly and precisely controlled. The precision of the control can be further improved in isochronous mode. To increase the output, the two channels of the module can be connected in parallel and thus provide a current of up to 1 A. Other operating modes are frequency output, the output of a pulse with a predefined length and the switch-on / switch-off delay. With the single-channel stepper motor module 1 step, which is used for positioning tasks with stepper motors, a new "motion task" has been added to move to a specified position. In speed mode, the frequency specified by the controller is output to the output, taking into account the acceleration / deceleration ramp. This operating mode is suitable for use with a higher-level positioning controller, if necessary also in isochronous mode. The XNUMX Step module has two digital inputs that can be configured as reference point and limit switches or as external start enable.