Siemens S7 PLC Analog Inputs & Outputs Devices Overview

 

  • In This chapter we discuss about Siemens S7 PLC'S ( Analog Inputs , Analog Outputs , Signal Modules Status Indicators ,  and Power Supplies ) devices overview.

Analog Inputs

Chapter -14

4 channel Analog input signal Module

  • An analog input signal is generated by a sensor that provides voltage or current that can vary within a range such as 0 to 10 volts or 4 to 20 milliamps.
  • An analog input signal module converts the current or voltage to a binary value that the CPU stores for use in the user program.
  • The number of bits in the binary value is referred to as the channel resolution.
  • The more bits the greater the number of values that can be represented.
  • The resolution available depends on the module.
  • For example, the accompanying graphic shows a signal module with a channel resolution of either 13 bits or 16 bits depending on the module version.
  • Temperature measurement is an example of an application that requires special signal processing.
  • Two types of sensors commonly used to measure temperature are Thermocouples and Resistance temperature detectors (RTDS).


  • A Thermocouples is a Temperature sensor made from two dissimilar metals joined at a point called a junction.
  • Thermocouple produces a small voltage that is Temperature dependent.
  • An RTD also called a Resistance Thermometer is a Temperature sensor made from a metal such as platinum, nickel, or copper that varies in resistance in a predictable manner as temperature varies.
  • There are various types of Thermocouples and RTD'S, and each type has different characteristics that determine its application range.
  • Because Thermocouple and RTD signals are different and require special processing some Siemens PLC'S have thermocouple and RTD signal modules.
  • However the S7- 1500 PLC analog input signal module shown in the accompany graphic can be used with a variety of analog signals  including RTD and thermocouple signals.


Analog Outputs

2 Channel Analog output module

  • When a CPU sends a numerical value to an analog output channel, the analog module converts the value to a voltage or current within the range set up for the output channel.
  • The channel is typically connected to an analog output device that is controlling something in a machine or process, such as motor speed, valve position, or temperature.
  • PLC analog output signal modules vary in the number of output channels, channel resolution, and output signal types.
  • The module shown in the accompanying graphic has two analog output channels.
  • These channels can be set up for either the -10 to +10 volts range or the 0 to 20 milliamps range.
  • The output resolution is 14 bits for the voltage range and 13 bits for the current range.


Signal Module Status Indicators

  • Signal modules have LED status indicators that are useful for system Installation and Troubleshooting.
  • For example the accompanying graphic shows two S7-1200 signal modules a combination digital input/output signal module and a combination analog input/output signal module.

  • Both modules have a status LED for each channel.
  • The digital channel status LED is green and turns on when the input or output is on.
  • The analog channel LED is green when the channel has been configured and is active and red when there is a channel error.
  • Both modules also have a diagnostic LED that is green when the module is operational and red when the module is defective or non-operational.

Power Supplies

  • Multiple system power supply types are typically available for a PLC model to match the system voltage.
  • System power supplies also specify a power budget which is the available power that a supply can provide to interconnected modules.
  • A load power supply provides power to input and output devices and channel circuits.
S7-1500 PLC Load power supply

  • In some cases, the load power supply also provides power to other PLC modules including a system power supply module.
  • Because input and output devices vary considerably in terms of their current voltage and power requirements load power supplies come in a variety of types and capabilities.
  • For example the accompanying graphic shows a load power supply module for an S7-1500 PLC that mounts on the mounting rail with other modules.
  • Siemens also manufactures a range of SITOP power supplies for use with many types of equipment including PLC'S.
SITOP Power Supplies



Chapter 15 we will discuss about ( Distributed I/O , System Configuration, PLC Tags , Monitoring values in CPU ) Topics ...

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