At present, small PLCs are single CPU systems, while medium and large PLCs are mostly dual CPU systems, and even some PLCs have up to 8 CPUs. For dual CPU systems, one is generally a word processor, and 8-bit or 16 bit processors are generally used; The other is a bit processor, which uses special chips designed and manufactured by various manufacturers. The word processor is the main processor, which is used to execute the programmer interface function, monitor the internal timer, monitor the scanning time, process byte instructions, and control the system bus and bit processor. Bit processor is a slave processor, which is mainly used to process bit operation instructions and realize the conversion from PLC programming language to machine language. The adoption of bit processor improves the speed of PLC and makes PLC better meet the requirements of real-time control.
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Our product: brand new original packaging
Our payment: 100% telegraphic transfer of inventory items before shipment, conditions can be proposed!
If you have any downtime spare parts that you cannot find, please feel free to call or use email to contact me. If there are issues that the product cannot solve, please contact me. Product prices can be negotiated. Please do not consider contacting me!
8121-DI-DC
16 input channels• For dry contact switches• 24 V dc provided on input high side• Returns commoned internally• Pulse counting option• 24 V dc bussed field power required MODULE SPECIFICATIONSee also System SpecificationINPUTSNumber of channels• 16OFF current • < 0.3 mAON current• >1.2 mAWetting current• 2.8 mA (typ.)Minimum pulse width detected• 5 msMax input freq in pulse counting mode (no-debounce)• 100 HzIsolation • Any channel to Railbus – 250 V acCONFIGURABLE PARAMETERSSelectable input filter• Fast, slow or user defined(User defined permits 0 to 512 ms values in 2ms steps)Latch inputs• Enable / DisableLatch polarity• Latch on high / latch on lowPulse counting• Enable / DisableRESPONSE TIMEI/O response time• Field event to new data available on Railbus – 5 ms (max.)SAFETYFM non-incendive field wiring parameters (each channel)• Voc = 30 V; Isc = 3.5 mA; Ca = 0.12 μF; La = 1000 mHPOWER SUPPLIESRailbus (12V) current• 90 mA (typ.)• 135 mA (max.)Bussed Field Power• 60 mA, @ 18–30 V dcMECHANICALModule Key Code• E1Module width • 42 mmWeight • 210 g
Our products are guaranteed for 1 year, with new and original production stopped and imported spare parts.
All prices listed on the official website are subject to confirmation by contact: Wu Jiedong (manager).
Our product: brand new original packaging
Our warranty: All new or repaired parts have a 12 month warranty period beginning
Our payment: 100% telegraphic transfer of inventory items before shipment, conditions can be proposed!
If you have any downtime spare parts that you cannot find, please feel free to call or use email to contact me. If there are issues that the product cannot solve, please contact me. Product prices can be negotiated. Please do not consider contacting me!
