ABB EHDB130 modular

Provided by Shanxi Runsheng Import and Export Co., Ltd

① Brand: ABB

② Model: EHDB130

③ Product category: module

④ Payment method: telegraphic transfer, USD, Western Union remittance

⑤ Freight: The freight in different regions shall be subject to the local freight forwarder

⑥ Does it include tariffs? It does not include any taxes.

⑦ Packaging: use the Seller’s safe packaging.

The working mode of PLC is scanning plus interruption, which can not only ensure its orderly operation, but also avoid the “risk competition” that often occurs in the relay control system, and its control results are always determined; In addition, it can deal with the control of emergency, which ensures the timely response of PLC to emergency situations and makes PLC work reliably.

In order to monitor whether the PLC operation program is normal, the PLC system is equipped with a “Watching dog” monitoring program. When running the user program, clear the “watchdog” timer and start timing. When the user program runs through a cycle, check the timer’s timing value. In case of timeout (generally no more than 100ms), an alarm will be given. In case of serious timeout, PLC can also be stopped. Users can take corresponding emergency measures according to the alarm signal. If the timing value of the timer does not time out, the start process will be repeated and the PLC will work normally. Obviously, with this “watchdog” monitoring program, the normal operation of PLC user program can be guaranteed, and the “dead cycle” can be avoided, which will affect the reliability of its work.