Battery Test; Flash Crc Tests - McQuay MicroTech II Installation And Maintenance Manual

Table 24: Main control board LED startup error codes
Battery Flash
CRC
LED
Startup
RS-485
Bus Port
RS-232
Port
IP
Port
MCB ON Blinking
Error
B1-1 ON
B1-2
B1-3
B1-4 ON
B1-5
B1-6
B1-7
B1-8
The following sections provide a brief description of each of
these startup tests and recommended steps to correct the
problem.

Battery Test

The battery test determines the status of the MCB battery.
When the battery fails the test, the error is indicated by the
red MCB Error LED and the Binary Input BI-1 LED turning
ON during the MCB Error Code Display period of the Main
Control Board LED Power-Up Sequence described above.
This warning signals the battery is nearing the end of its
useful life and should be replaced. Regardless of the battery
status, the MCB board will continue execution of the on-
board program. Once the Main Control Board LED Power-
Up Sequence is complete, the red Error LED will blink on
and off at a rate of one second on and one second off if the
battery is bad and will remain off if the battery is good. Note:
After battery replacement, the Error LED will not revert to
the normal off condition until one of the following occurs:
1. Power is cycled to MCB.
2. The battery is tested at two minutes after midnight each
day. If battery is normal then, the Error LED reverts to
normal.

Flash CRC Tests

The startup Flash memory tests consists of sector by sector
CRC check of the three Flash code bases; Startup, Boot, and
Main and two Flash data bases; Dictionary and
Configuration. The results of all five tests are saved in
SRAM for use by the operating system. A Dictionary failure
38
Startup Errors
Flash Flash RAM
CRC CRC Low
Main/ Config. Byte
Boot
Blinking Blinking Blinking
ON
ON
ON
RAM N2 RS BACnet-
232 MSTP/Lon
High Bus
Port
Byte Port
(Optional)
ON
ON
Blinking ON ON
ON
does not result in a startup error display. The following
scenarios describe the possible failure modes of the flash
CRC tests.
Bad CRC in startup Code Base.
Startup Flash CRC error during the MCB Error Code
Display period of the Main Control Board LED Power-Up
Sequence, the startup process continues, if possible. Since
the startup code validity is questionable, correct operation
from this point is unpredictable. Re-downloading the startup
code is recommended. If this is not possible or ineffective,
MCB should be replaced.
Bad CRC in Main Code Base and Boot Code Base.
displaying the Main/Boot Flash CRC error during the MCB
Error Code Display period of the Main Control Board LED
Power-Up Sequence, the startup process continues. After the
startup sequence is completed, execution will be passed to
the Boot code. Since the Boot code validity is questionable,
correct operation after entering Boot code is unpredictable.
A CRC failure in only the Boot or only the Main code base
will not result in an error display. Re-downloading the Main
and Boot code is recommended.
Bad CRC in Configuration Data Base.
that will require replacement of the MCB. The configuration
database contains user and factory defined configuration
parameters including the device name, communication
parameters, and I/O setup and calibration data. After
displaying the Configuration Flash CRC error during the
MCB Error Code Display period of the Main Control Board
LED Power-Up Sequence, the startup process continues. If
I/O IP
Expansion Port
Mark
Port
Port
ON
ON ON ON
ON
ON
After displaying the
After
This is a fatal error
McQuay IM 710-1