Brooks Instrument SLA5800 Series - Manual (Page 42)

3-10
Brooks ® Digital MFC's & MFM's
Section 3 Operation
Installation and Operation Manual
X-TMF-SLA5800-MFC-eng
Part Number: 541B027AAG
April, 2013
3-6-2 Diagnostic Alarms (Analog versions only)
A Diagnostic Alarm will be indicated when any of the diagnostics below
detect a failure providing a visual indication via the red and/or green LED,
and activating the TTL open collector output located on the 15 pin
D-Connector. The diagnostic test or tests that have detected a problem
and caused the Diagnostic Alarm to occur can be determined only by
reading a parameter via the Service Port. When a diagnostic alarm occurs,
the device will automatically reset after approximately 5 seconds.
Safe Mode
When the Device is in Safe Mode, the following behavioral characteristics
of the device apply:
Flow Output Signal will be set to its defined Safe State for the following
output signal types:
0 to 5 Vdc: 0 Vdc
1 to 5 Vdc: 1 Vdc
0 to 20 mA: 0 mA
4 to 20 mA: 0 mA
In the Safe State, the valve will be unpowered. This means that for
Normally Closed valves, the valve will stay closed and for Normally Open
valves, the valve will stay open.
Diagnostic Failure Description
RAM Byte by byte test of RAM detects bad memory location
Flash (Program Memory) 8-bit Checksum of the entire Flash not zero.
Non-Volatile Memory Byte by byte test of Non-Volatile Memory detects bad memory
location
Temperature Sensor Temperature Sensor reports a value outside the designed range of
0° C to 100° C
Power Supply (Internal) Any internally generated power supply voltage outside operational
limits. (3.3 Volt and 7.6 Volt internal supply voltages must be within ±
5% of nominal value.)