Model 10BDHM "B" Health Monitor Card
is a "B-sized" companion card to the Model 10AHM Health Monitor Card. When connected to the 10AHM via a special cable, it can be used to monitor B-Deck voltage supplies, plus critical software handshake lines and other dynamic signals.
The following table describes the 13 diagnostic "subchannels" furnished by the 10BDHM. Like the 10AHM-sourced subchannels, they can be scaled and filtered like any analog data channel, and can be continuously and automatically monitored for conformance to specific limit values.
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Model 10BDHM Subchannels |
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No. 9 |
Measures the microprocessor's +5-V rail |
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Nos. |
Measure the B-Deck ±12-V supplies. These power the A/D, RS232 I/O, internal monitor, etc. |
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No. 12 |
Measures the "ISO-5 V" supply for Model 10BIO-16 Universal Logic I/O Cards |
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No. 13 |
Measures the active-low EEPROM Enable signal on the B-Deck |
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Nos. 14, |
Measure the state of the "handshake" lines among the B-Deck cards. These active-low lines toggle briefly when messages move from board to board. A persisting logic low (>0.7 V) indicates internal communications problems or one or more external devices that are not ready to receive data from the System 10. |
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Nos. 17, |
These channels are "stretched" versions of Nos. 14, 15, and 16, and are used to verify that messages are being properly sent |
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Nos. |
These channels are B-Deck counterparts of the 10AHM-sourced Subchannel Nos. 7 and 8 (SIGNAL COMMON and POWER COMMON)—see 10AHM table |