WOODWARD EGCP-2 Digital Control Panel 8406-121


Maximum PT input voltage range 50–150 Vac rms (8406-121)

Category: SKU: 8406-121 Tag:
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Potential Transformer Input Ratings for 8406-121
Number of inputs: 4
Maximum Voltage Rating: 50–150 Vac
Burden: 0.25 VA
Input Frequency: 40–70 Hz

Components needed for installation and remote communication. These items do not ship with the 8406-120 and 8406-121 part numbers—they must be ordered separately.
• 8928-301—EGCP-2 connector kit. Contains all of the mating terminal blocks for the EGCP-2. See Appendix A for mating connector information.
• 5417-551—Communication Cable for RS422. This cable will connect your PC to the EGCP-2 RS422 port. This is a point-to-point connection. It can be used with EGCP-2 software tools. Communication Manual 26181 contains the software tool information.


The development direction of large-scale PLC mainly includes the following aspects:
① Continuously enhancing functions: not only does it have basic functions such as logical operation, counting, and timing, but it also has functions such as numerical calculation, analog adjustment, monitoring, recording, display, computer interface, communication, etc.
Network functionality is an important feature of PLC development. Various personal computers, graphic workstations, mini computers, etc. can serve as monitoring hosts or workstations for PLCs. The combination of these devices can provide functions such as screen display, data acquisition, record keeping, and circuit panel display. A large number of PLCs are interconnected and the compatibility of PLCs produced by different manufacturers has increased, making it easy to achieve decentralized control or centralized management.

② The application scope is constantly expanding: not only can it perform general logic control, but a complete range of interface modules can also perform interrupt control, intelligent control, process control, remote control, etc.
PLCs used for process control often have high requirements for memory capacity and speed. Therefore, high-speed analog input modules, dedicated independent PID controllers, multiplexers, etc. have been developed to unify digital and analog technology in programmable controllers. The combination of software and hardware makes programming and wiring much more convenient than using conventional instrument control in the past.

③ Continuously improving performance: adopting high-performance microprocessors to improve processing speed and accelerate PLC response time; In order to expand storage capacity, many companies have used magnetic bubble memory or hard drives; Adopting multi processor technology to improve performance; Adopting redundant hot standby systems or two out of three voting systems to improve system reliability.
In order to further simplify system design and programming in the field of specialized control, there are more and more specialized intelligent input and output modules, such as specialized intelligent PID controllers, intelligent analog I/O modules, intelligent position control modules, language processing modules, specialized CNC modules, intelligent communication modules, calculation modules, etc. One characteristic of these modules is that they have a CPU and can work independently. They operate in parallel with the PLC host, regardless of speed Precision, adaptability, and reliability have all provided excellent supplements to PLC. They are closely integrated with PLC, which helps to overcome the limitations of PLC scanning work mode and complete many functions that cannot be completed by PLC itself.

④ Diversification, advancement, and standardization of programming software: adopting multiple programming languages, including step-by-step sequential language for sequential control and flowchart language for process control systems. The latter is a functional block oriented language that can represent the interconnection between dynamic variables and signals in the process; There are also high-level languages compatible with computers, such as BASIC, C, and assembly language; In addition, there are specialized high-level languages, such as Mitsubishi’s MELSAP, which uses compilation methods to convert statements into ladder programs; There are also languages that use Boolean logic, where the CPU can directly perform AND, OR, XOR, and NOT operations. This language has a fast execution speed but is not very intuitive. PLC will also have a database and can achieve database sharing across the entire network. It will also continuously develop adaptive control and expert systems.

⑤ Decentralization and centralization of the composition form: PLC and I/O ports are decentralized, with each I/O port having as few as a dozen input and output points, and scattered units ranging from dozens to hundreds. Communication and network functions are gradually enhanced. As a branch of CIMS and CIPS, PLC itself can also be decentralized. The combination of decentralized PLC and upper computer forms a distributed system for decentralized control, which facilitates the formation of multi-layer distributed control to achieve automated control and management of the entire factory or enterprise. Different models of PLCs can be easily connected to each other and between PLCs and computers, achieving resource sharing. In addition, powerful network monitoring software forms a large-scale PLC control network system.