发明名称 |
Programmable logic controller customized function call method, system and apparatus |
摘要 |
A programmable logic controller with enhanced and extended the capabilities. A digital input filter implement filters with considerable less logic by simulating the action of a capacitor being driven by a constant current source whose output voltage is sensed by a comparator with a large amount of hysteresis. A pulse catch circuit captures the input pulse even though the update occurs between scan cycles. A pulse output controller includes a hardware pipeline mechanism to allow for smooth, hardware-controlled transitions from wave-form to wave-form. A free port link allows the user to control the port either manually or by operation of a user program. In order to provide higher performance for communication using PPI protocol, the PLC includes a built-in protocol. An n-bit modem protocol ensures data integrity without use of a parity type data integrity system. A hide instruction protects proprietary software by encrypting the sensitive code and decrypting the code during compilation and, thereafter, re-encrypting the code. A system function call allows the user to create and/or download new PLC functions and implement them as PLC operating system functions. An STL status function debugs programs during run-time and while the program is executing. A micro PLC arrangement provides compact size and efficiency.
|
申请公布号 |
US6904471(B2) |
申请公布日期 |
2005.06.07 |
申请号 |
US20000732574 |
申请日期 |
2000.12.08 |
申请人 |
SIEMENS ENERGY & AUTOMATION, INC. |
发明人 |
BOGGS MARK STEVEN;FULTON TEMPLE L.;HAUSMAN STEVE;MCNABB GARY;MCNUTT ALAN;STIMMEL STEVEN W. |
分类号 |
G06F1/025;G06F11/36;H04L1/00;(IPC1-7):G06F3/00 |
主分类号 |
G06F1/025 |
代理机构 |
|
代理人 |
|
主权项 |
|
地址 |
|