- 1328 -
PortStatus
10:48 1/2
*Port1_Link UP
Port2_Link DOWN
PortStatus
10:48 1/2
*Port1_Link UP
Port2_Link UP
Port 1 (i.e., Port A) is connected.
Port 2 (i.e., Port B) is not connected.
Ports 1&2 (i.e., Port A&B) are connected.
Figure 11.2-2 Communication status
Status signals for Port A and Port B: The user can also examine the LAN status
using PLC signal monitoring points ‘Port1_Link (3100061001)’ and ‘Port2_Link
(3100061001)’ of the HOTST function. For example, when the user wishes to monitor
the status of the Prot1_Link, use the ‘Port1_Link’. Consequently, the user can get the
physical information about the Port A: the value ‘1’ is issued when the communication
is made (Linkup), whereas value ‘0’ is issued when the communication is not made
(Linkdown).
When Hot_Standby is set for the [RedundantMode], the user can find a running port
using the PLC signal monitoring point ‘Using_CH (3100081001)’ of the HOTST
function. Value ‘1’ is provided when the Port A is running, whereas value ‘2’ is
provided when the Port B is running.
Monitor setting: The Hot-standby (HOTST) function can send PING packets to
remote devices thus enabling the Hot-standby function to monitor the state of the
network. The Hot-standby function checks for a response signal from the remote
device. If the Hot-standby function does not receive a response signal, the Hot-
standby function will switch to the other port. The operation is performed when
the user sets the [RedundantMode]= Hot_Standby and [NetMonitor_EN] = On.
Settings [Ping_IP1] to [Ping_IP12] are provided in the Hot-standby function for the
monitoring of remote devices on the network. When the user sets plural remote IP
addresses for the settings [Ping_IP*], and if the Hot-standby function does not receive
a response from any one of these remote devices, the Hot-standby function determines
that a communication failure has occurred. Table 11.2-3 shows the network
monitoring settings for Hot-standby operation.
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