ABB AC 800M Manual page 180

AC 800M Controller (PM8xx)
P(ower)
B(attery)
Tx
Rx
Valid for PM861/PM864/PM865/PM866/PM891
PRIM(ary)
DUAL
(1) The software performs cyclic battery voltage level tests via a dedicated LED control input. The
battery provides back-up power for both the application memory and the real time clock during
power down. The battery is either accessible via the PM8xx cover panel or externally connected
to the external battery connector. Battery voltage is checked by the software. Voltage is common
for both the internal and external battery. For this reason the internal battery should be removed
when using the external battery, since having two batteries connected in parallel will result in
greatly reduced capacity.
(2) Only for PM891
(3) Not valid for PM891
(4) Only CN1 for PM851/PM851A. Do not connect to CN2.
180
Table 20. PM8xx – LED Indicators (Continued)
Marking Color
Green
Green
Yellow
Green
Yellow
Green
Yellow
Yellow
Normal state – ON
When lit, indicates that the CPU DC/DC
converter is generating valid +5 V and +3.3 V
DC supply voltages.
No software control.
Normal state – ON
Lit when internal or external battery voltage is
above 3.1 V. The LED is controlled by a
software battery voltage test
Data Transmission
(2)
CN1 + CN2 and COM3
Flashes in synchronization with Tx traffic
Data Reception
(2)
CN1 + CN2 and COM3
Flashes in synchronization with Rx traffic
Lit in single and redundant configuration.
Indicates Primary CPU in redundant
configuration. Controlled by software.
Lit when the CPU is running in redundant
configuration and synchronized state.
Section 4 Operation
Function
(1)
.
(4) , 
(3)
+ COM4
, 
(4)
(3)
+ COM4
3BSE036351-510 A