1. Can the digital input of the same module be connected to NPN and PNP signals at the same time?
No, because the two types of signals NPN and PNP are in opposite directions to the current at the DI point in the loop formed by the DI terminal, and similarly the current direction at the M point is also opposite, as shown in Figure 7 and Figure 8, the current direction of the NPN and PNP loops is different, if the two signals are connected to the same M terminal, then the M terminal has two current flow directions, which is incorrect. Therefore, it is not possible to connect both NPN and PNP signals to the DI input of the same module.
2. There are two types of DO, transistors and relays, what is the difference between them?
The load current of the relay is larger than that of the transistor, but the output frequency cannot be affected too quickly by the mechanism, and there is a limitation of the mechanical life. The load current of the transistor is smaller than that of the relay, but the output frequency is fast, and it can be used for high-speed pulse output without the limitation of mechanical life.
3. Can the S7-200 SMART CPU be connected to a leaky device?
No, the DO side of the S7-200 SMART CPU and expansion module can only be connected to a source 24V device, that is, an open-collector PNP device.
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Siemens' intelligent manufacturing engineering talent certification system was officially released
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Siemens 3RM Motor Starter - Safety Integrity Level for ATEX Explosion Protection Applications
Questions:
Why do the 3RM11/3RM13 motor starters have a safety class of SIL2 for ATEX protection and SIL3 and PLe for functional safety applications?
Answer:
The 3RM11/3RM13 motor starters include two different protections ...
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3RW402-404 Soft Starter Fan is not a standard equipment ...
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What cable lengths are available between the motor and the soft starters 3RW22, 3RW30, 3RW31, 3RW34, 3RW40, 3RW44
3RW22 (no longer available):
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3RW30xx-xAAxx 3RW30xx-xABxx, 3RW30xx-xCBxx, 3RW31xx-xCBxx (no longer available):
...
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Siemens 3RW44 Causes of Failure of 95, 96, 98 Soft Starter
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(2) West ...
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