Output Relay Recovery; Internal Diagnostics; Memory Diagnostics; Microprocessor Monitor - EDI SmartMonitor MMU-16LE Series Operation Manual

2.9 OUTPUT RELAY RECOVERY

Prior to the MMU-16LE SmartMonitor
state to the no-fault state, a transition state with duration of 500 milliseconds will occur.
During the transition state the Output Relay will remain in the fault state and the Start-up
Flash Call bit in the Type 129 frame will be set to 1.

2.10 INTERNAL DIAGNOSTICS

The MMU-16LE SmartMonitor
capabilities which monitor for correct operation of the MMU-16LE SmartMonitor
power-up and continuously during operation. Should an internal diagnostic error occur,
other fault indicators that may be concurrently displayed with the DIAGNOSTIC indicator
may not be valid due to the nature of these hardware and/or firmware failures.

2.10.1 MEMORY DIAGNOSTICS

On power-up, the MMU-16LE SmartMonitor
components including RAM, EPROM, and non-volatile EEPROM. During operation the
MMU-16LE SmartMonitor
volatile memory components. When either diagnostic test fails, the MMU-16LE
®
SmartMonitor will enter the fault mode, transfer the OUTPUT relay contacts to the Fault
position, and illuminate the DIAGNOSTIC indicator. An MMU Power Failure will reset the
Diagnostic fault state of the monitor (see Section 2.6). Due to the nature of these
hardware/firmware failures, other fault indicators that may be concurrently displayed with
the DIAGNOSTIC indicator may not be valid.

2.10.2 MICROPROCESSOR MONITOR

The MMU-16LE SmartMonitor
internal microprocessor. This monitoring circuit receives a logic transition signal from the
microprocessor every 5 msec. When this logic transition is not received for 300 msec, the
MMU-16LE SmartMonitor
the Fault position, and illuminate the DIAGNOSTIC indicator. Due to the nature of these
hardware/firmware failures, other fault indicators that may be concurrently displayed with
the DIAGNOSTIC indicator may not be valid.
This type of failure is configured as latching. If the microprocessor resumes operation the
unit will not return to normal operation. With latching operation, only a loss of AC Line will
restore operation. If non-latching operation is desired, internal jumper E1 (Latching MPU
Fault) may be removed.

2.10.3 INTERNAL HARDWARE MONITOR

The MMU-16LE SmartMonitor
sections of the internal circuitry. Should a malfunction be detected, the MMU-16LE
®
SmartMonitor will enter the fault mode, transfer the OUTPUT relay contacts to the Fault
position, and illuminate the DIAGNOSTIC indicator. An MMU Power Failure will reset the
Diagnostic fault state of the monitor (see Section 2.6). Due to the nature of this hardware
failure, other fault indicators that may be concurrently displayed with the DIAGNOSTIC
indicator may not be valid.
Eberle Design Inc.
MMU-16LE SmartMonitor
Operations Manual
®
transferring the Output Relay contacts from the fault
®
is supplied with a resident series of self check diagnostic
®
continuously performs a check sum verification of the non-
®
contains circuitry which monitors the operation of the
®
will enter the fault mode, transfer the OUTPUT relay contacts to
®
contains circuitry which verifies the operation of the many
®
verifies the operation of all memory
®
both at
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