SIMATIC S7-1500/ET 200MP Analog input module

Features The module has the following technical features:

● 4 analog inputs

● 16 bit precision (including symbols)

● The measurement type of voltage can be set according to the channel

● The measurement type of current can be set according to the channel

● The type of resistance measurement can be set for channels 0 and 2

● Thermal resistance (RTD) measurement types can be set for channels 0 and 2

● The measurement type of thermocouple (TC) can be set according to the channel

● Configurable diagnostics (per channel)

● Hardware interrupts can be set by channel when the limit is exceeded (2 lower limits and 2 upper limits per channel) Usage characteristics of PTC resistors PTC resistors are suitable for monitoring the temperature of electrical equipment such as motors, drivers and transformers.

According to DIN/VDE 0660 Part 302, PTC resistors of type A (PTC thermistors) are used. To do this, follow these steps:

1. In STEP 7, select Resistor (2-wire terminal) and PTC.

2. Connect the PTC using the 2-wire connection technology. If Underflow diagnosis is enabled in STEP 7, a signal is sent when the resistance value is less than 18 Ω. At this point, the diagnosis will report a "short wiring" fault. Temperature coefficient The temperature coefficient depends on the chemical composition of the material. In Europe, only one value (the default) is used for each sensor type. The temperature coefficient (α value) indicates the degree to which the resistance of a particular material changes accordingly when the temperature rises by 1°C. Other values facilitate the setting of sensor-specific temperature coefficients and improve accuracy. Interference frequency suppression On the analog input module, interference generated by the alternating current frequency can be suppressed. The frequency of the AC power network can make measurements unreliable, especially in the low voltage range and when thermocouples are being used. For this parameter, the user defines the power frequency of their system. Filter Each measured value can be filtered through the filtering function. Filtering can be set to four levels. Filter time = number of module cycles (k) x module cycle time. The figure below shows the module cycles that are experienced when the filter analog value approaches 100%, depending on how the filter is set. This applies to every signal change in the analog input.

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