AH500 Hardware and Operation Manual 
12-18 
Error 
Description  Solution 
16#E280 
The network module IP of the control 
mode CPU on the main backplane slot 0 
cannot be detected. 
1. Make sure the network cables of the network 
modules on the main backplane slot 0 are 
well-connected both on the control mode CPU 
and standby mode CPU.     
2. If the network module’s network cable of the 
control mode CPU on the main backplane slot 0 
is connected to the network port 1, the network 
module’s network cable of the standby mode 
CPU on the main backplane slot 0 must be 
connected to the network port 1 as well.     
3. Mare sure the network modules of the control 
mode CPU and the standby mode CPU on the 
main backplane slot 0 are on the same physical 
16#E281 
The network module IP of the control 
mode CPU on the main backplane slot 1 
cannot be detected. 
1. Make sure the network cables of the network 
modules on the main backplane slot 1 are 
well-connected both on the control mode CPU 
and standby mode CPU.     
2. If the network module’s network cable of the 
control mode CPU on the main backplane slot 0 
is connected to the network port 1, the network 
module’s network cable of the standby mode 
CPU on the main backplane slot 1 must be 
connected to the network port 1 as well.     
3. Mare sure the network modules of the control 
mode CPU and the standby mode CPU on the 
main backplane slot 1 are on the same physical 
16#E282 
The network module IP of the control 
mode CPU on the main backplane slot 2 
cannot be detected. 
1. Make sure the network cables of the network 
modules on the main backplane slot 2 are 
well-connected both on the control mode CPU 
and standby mode CPU.     
2. If the network module’s network cable of the 
control mode CPU on the main backplane slot 2 
is connected to the network port 1, the network 
module’s network cable of the standby mode 
CPU on the main backplane slot 2 must be 
connected to the network port 1 as well.     
3. Mare sure the network modules of the control 
mode CPU and the standby mode CPU on the 
main backplane slot 2 are on the same physical