发明名称 |
Fault detection apparatus for a programmable controller |
摘要 |
A battery monitoring circuit in a programmable controller generates a logic signal when it senses a low output voltage from a memory back-up battery. A controller processor is programmed to set a fault status bit and store it in a memory with input/output status data. The fault status bit is output to an I/O interface rack together with input/output status data during an I/O scan routine. The fault status bit generates a logic signal to a fault indicating device on the I/O interface rack to signal an under-energized memory battery in the controller processor.
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申请公布号 |
US4251883(A) |
申请公布日期 |
1981.02.17 |
申请号 |
US19790030616 |
申请日期 |
1979.04.16 |
申请人 |
ALLEN-BRADLEY COMPANY |
发明人 |
GRANTS, VALDIS;SCHULTZ, RONALD E. |
分类号 |
G05B19/05;(IPC1-7):G06F11/00 |
主分类号 |
G05B19/05 |
代理机构 |
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代理人 |
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主权项 |
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地址 |
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