YOKOGAWA FA-M3 Vitesse, Руководство пользователя

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8-8
IM 34M6H33-01E 1st Edition : July 1.2004-00
Sample Circuit for Detecting Invalid Slaves and Checking ASi System
Error Alarms
Figure 8.3 Sample Circuit for Detecting Invalid Slaves and Checking ASi System Error Alarms
TIP
- The above circuit uses XOR between LPS and LDS to detect both failed slaves, as well as detected
slaves that are not registered in the LPS.
AlmSlv1 and AlmSlv2 store the error statuses of slaves 01A to 31B, and AlmSlv3 and AlmSlv4 store
the error statuses of slaves 01B to 31B, starting from the least significant bit. A '1' bit indicates an
invalid slave and a '0' bit indicates a valid slave. The ASi Master module sets all slaves to invalid
status during initialization.
- ASi system error alarm indicates any one of three errors: ASi power supply error, not in protected
mode and configuration mismatch.
- Additional circuits are required to detect slave peripheral faults (for V2.1 only).
- See also subsections 4.1.1, 4.1.3 and section 8.1.
Read LPS and LDS; Detect invalid slaves
ASi System Error Alarm
Read LPS
Read LDS
Positions of invalid
slaves
Bit shift right 1
Positions of invalid
slaves
Bit shift right 1
All slaves invalid
All slaves invalid
Alarm indicator