Honeywell 621-9938 I/O Module
Brand: Honeywell
Module: 621-9938
Description: I/O Module
Product Orgin: USA
Honeywell 621-9938 I/O Module. The full name of HONEYWELL DCS control system is “distributed control system”, and the full name of PLC is “programmable controller”. The difference between them is that the system and the device can realize the function and coordination of any device, while PLC can only realize the function of the current unit.
1. In terms of network:HONEYWELL DCS network is a safe and reliable communication network with better expansibility and openness, while the network form adopted by PLC is a single network structure, without good network protection measures.
2. HONEYWELL DCS considers the scheme as a whole. The operator station has the function of engineer station. After the program of operation scheme is installed, there is a close relationship between stations. Any station, any function and any controlled device are all interlocked and controlled by each other; However, for a system composed only of HONEYWELL PLC interconnections, the connection between stations (PLC and PLC) is a lax connection mode, which is unable to achieve the function of coordinated control.
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