SIMATIC ET 200S Technology Modules

Overview

Description
Counter Module 1 COUNT
Position Decoder Module 1 SSI
Stepper Motor Module 1 STEP
Positioning Module 1 POS U
Intelligent control of actuators and valves 2 PULSE

Description

For the solution of technological tasks, high-performance function modules are available that perform these tasks largely autonomously and relieve the CPU significantly. Used directly on site; e.g. for counting, measuring and positioning tasks. Parameterization using STEP 7 or GSD file; serial interface.

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Counter Module 1 COUNT

The single-channel counter modules 1 COUNT 5 V/24 V are ideally suited to distributed counting and measuring applications. The modules supply the 24 V to the connected encoders. 1 COUNT acquires the encoder pulses in accordance with gate signals (e.g. light barriers connected to an integrated digital input).

The direction of the signals is evaluated, the counter value/measured value is compared with a pre-specified value and a response is output over an integrated digital output.

The counter modules support the following functions:

One-off, periodic, continuous counting
Length, frequency, speed and period duration measurements
Position measuring with incremental encoder

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Position Decoder Module 1 SSI

The single-channel 1 SSI signal module enables SSI encoders to be connected to ET 200S and allows simple positioning tasks to be implemented. The actual positioning algorithm is processed in the CPU, e.g. with Easy Motion Control.

The 1 SSI module acquires the actual values of the SSI encoder (13 to 25 bit) and makes them available to the higherlevel master (e.g. the CPU).
The actual value can also be compared with two values specified by the master.
1 SSI supports a cycle time of 250 s in isochronous mode. A slower encoder can also be operated in synchronization with down-scaling.
Protection of transmission by parity bit

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Stepper Motor Module 1 STEP

The single-channel stepper motor module 1 STEP performs positioning tasks in combination with stepper motors. It is suitable, for example, for feed equipment in assembly lines, transfer lines, printing machinery, paper and textile machinery.
The following traversing tasks are available:

Relative positioning:
The axis is moved along the specified route
Absolute positioning:
The axis is moved to the specified position
Reference point travel:
The axis is moved in order to find the reference point and to initialize the measuring system
Speed operation:
The frequency specified by the controller is sent to the output, taking into account the acceleration/delay ramp. This operating mode is also suitable for using the 1 STEP on a higher-level position controller as an output for stepper motors, if necessary also in isochronous mode.

For flexible use, the current speed, the current position, or the distance still to be traveled are available as a checkback value.
The 1 STEP has two digital inputs with configurable functionality as:

Reference point switches for supporting the reference point approach
Upper or lower limit switches in order to restrict the range of travel
External stop in order to stop the axis with an external signal
External pulse enable in order to enable operation by means of an external signal

Simultaneous use as a reference point switch and limit switch is possible.

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Positioning Module 1 POS U

The single-channel positioning module 1 POS U is suitable for positioning positioning axes and operating axes - for both linear and rotary axes. It is used, for example, in paper and cardboard processing machines, in the food processing industry and in conveyor systems.

Controlled positioning is performed in accordance with the rapid traverse/creep feed principle with three digital outputs that control the drive. The axis can be traversed to an absolute position or by a relative path.
In the jog function, the control signals are specified by the user program and connected through by the module.
Three 24 V digital inputs are used for reference-point approach and as a hardware limit switch.
Parameterization during normal operation (for switchover/ switch-off difference) is possible.
Apart from the actual value, the residual distance can be read back.
With a 2-position valve, 1 POS U also supports proportioning operation; in this case only one channel of the incremental encoder is evaluated

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Intelligent control of actuators and valves 2 PULSE

2 PULSE - Intelligent control of actuators and valves

The dual-channel technology module 2 PULSE is used to activate final controlling elements and valves.

In combination with the SIMATIC software control packages, e.g. Standard PID Control, it can output pulse-width-modulated control outputs and therefore off-load the CPU.

The module can be used to control semiconductor contactors or for switching heating elements, for example.

The 2 PULSE module operates in the following modes:

Pulse output:
On the 24 V digital output, a single pulse is output for the specified duration
Pulse train:
On the 24 V digital output, a number of pulses specified by the user is output at the predefined frequency
PWM (pulse width modulation):
A pulse-width-modulated signal sequence is output on the 24 V digital output
ON/OFF delay:
A signal that is active on a 24 V digital input is output on the 24 V digital output with an ON-delay or OFF-delay
Frequency output:
A preset frequency up to 5 kHz is outputat the 24 V output.

In the PWM and pulse string operating modes, the 2 PULSE can measure the current output in each case and report it to the CPU. The measured value is averaged over the period. This enables simple proportional valves to be directly connected and precisely regulated. Isochronous mode improves the precision of the closed-loop control even further.
To increase performance, the two channels of the module can be switched in parallel, enabling them to provide a current of up to 4 A.
The extended user data interface offers greater user-friendliness when controlling the module.

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