System overview
3.6 Input and output modules
Automation system
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System Manual, 12/2017, A5E03461182-AE
Benefits
Analog output modules convert a 16-bit digital value into current or voltage and output it at
the process. With the analog output modules you control, for example, proportional valves or
small servo drives.
The analog output modules provide you with the following advantages:
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Front connector in screw-type connection system or in push-in system (35 mm width) or
push-in system for 25 mm modules
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same mechanical design, same handling and same accessories for all modules
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components required for shielding are included in the scope of delivery and allow simple
and quick installation without the use of tools
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same pin assignment for wiring, which means that circuit diagrams and wiring plans can
be universally used
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any combination of narrow and wide modules
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can be used centrally in SIMATIC S7-1500 and in ET 200MP distributed I/O system
Overview of functions
In the following you will find a brief overview of special functions of the modules. A detailed
description of the functions is available in the device manual of the module.
Calibration in runtime
The following analog modules offer you the calibration function at runtime:
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AQ 2xU/I ST
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AI 4xU/I/RTD/TC / AQ 2xU/I ST
The calibration compensates for influences on the measuring result by cables and/or
temperature. A calibration checks the process values output by the analog output module,
determines the deviation from the actual values and compensates for output errors.
Typical use:
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for plants in which sensors process relatively small voltages or currents.
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for applications which require regular calibration for all components in a measuring circuit.
Oversampling of the AQ 8xU/I HS analog output module
Oversampling divides a PROFINET bus cycle into equidistant bus sub-cycles. This requires
isochronous mode.
Oversampling acquires data with high time resolution but without using an extremely short
PROFINET bus cycle and thus fast CPU cycles. Used, for example, for controlling a feed
valve, the output data is controlled exactly at the current position of the machine.
Summary of Contents for Simatic S7-1500/ET 200MP
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