Honeywell 7800 - Manual (Page 6)

7800 SERIES S7810B MULTI-DROP SWITCH MODULE
65-0228—3 6
Fig. 3. Explanation of MODE LED light patterns.
Pattern in Seconds Description
OFF LINE: The S7810B is not receiving any messages from the QS7800B
ControlBus™ Module.
LED is off for 1.5 seconds and on for 0.1 second.
Check for:
• Wiring problems on multi-drop bus (loose connections, broken wires, or
miswired connections.
• QS7800B ControlBus™ Module or S7810B Multi-drop Switch Module
not connected to multi-drop bus.
• QS7800B ControlBus™ Module not properly seated in Q7700 Network
Interface Unit slot.
• No power to Q7700 Network Interface Unit.
SENSING: The S7810B is receiving messages from the QS7800B
ControlBus™ Module.
LED is off for 0.8 second and then on for 0.8 second.
The SENSING pattern reverts to the OFF LINE pattern when it has not
received a message from the QS7800B ControlBus™ Module for more
than four seconds.
ALARM LISTEN: The S7810B monitors devices on the local bus and
notes any alarm condition.
LED is on for 1.6 seconds then reverts to the SENSING or switch closed
pattern.
SWITCH CLOSED: The S7810B multi-drop bus port switch has been
switched on by the QS7800B ControlBus™ Module and data from the
local bus is being sent to the multi-drop bus.
LED is off for 0.1 second and on for 0.1 second, repeating for the 1.6
seconds duration.
FAULT: The S7810B has an internal fault.
LED is off for 1.3 seconds, on for 0.1 second, off for 0.1 second, on for 0.1
second. (Pattern is mainly off with two short blinks.)
STEADY STATE CONDITIONS:
LED is always OFF. S7810B is either defective or no power has been
applied to it.
LED is always ON. S7810B is defective.
1.5
0.1
M13028
0.8 0.8
M13029
(RETURNING TO
EITHER SENSING
OR SWITCH
CLOSED PATTERN)
1.6
M13030A
0.8
0.1
M13031
1.3
0.1
M13032
OR
M13033
ON
OFF