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This is an optional feature and will only be available if it has been licensed in the key file.
To provide server redundancy, Acquire will run with two simultaneous servers that are both active. Both servers actively poll the flowcomputers and both can be active as the HMI. This means that the secondary server can be available for use at any time and can be used as a second control point into the system.
This approach provides an automatic failover if one of the servers becomes unavailable.
Acquire redundancy assumes that the network connection between Acquire servers is reliable. Any disruption in the network connection may affect the integrity of the data. For this reason it is strongly recommended that the Acquire servers are connected to the same (preferably redundant) network switch. Connecting the servers together over the internet or a WAN is discouraged. This affects all data types.
Redundancy can run both in local mode and web mode. In web mode, the user can select any one of the servers to use.
If one of the servers goes down, the user can continue to access to the other server. When the server comes back online, both servers will detect inconsistency in the datafile and update the data accordingly. However, if there are changes to the server settings while one of the servers is down, it will be necessary to update the data file manually. See ‘Synchronization of Redundant Servers’ for more details.
Setting up redundant Acquire servers is just as easy as setting up a single server. Once Acquire has been configured on one of the servers, copy the configured datafile to the redundant server.
Acquire uses the latest technology to provide a state-of-the-art solution that is highly resilient at every level:
Acquire can run with two live HMI servers that both receive up to the minute information from the flow computer. If a server goes down while the user is connected to it, they can continue to access/control the information from the other server. When the server comes back online it is automatically brought back up to date with the data that it missed while it was offline.
Acquire can communicate with the flow computers over two separate network connections and will seamlessly switch over to the second network if any part of the first network fails. The only indication to the user that this switchover has occurred is an alarm stating that a network component has failed.
A pair of duty/standby flow computers can be deployed to ensure that the meter station can continue to operate even if a flow computer goes down. Acquire constantly monitors both the flow computers and automatically switches to the standby machine if the duty flow computer fails.
Acquire is multi-user straight out of the box, so multiple workstations can connect to the Acquire server at one time. If a workstation fails then the operator can simply switch to another workstation or start using the server itself.
Acquire enables workstations to connect using duplicate Ethernet connections on the operator network. The operator’s browser will automatically switch networks if one of the networks should go down.
Combine all of the above to build a totally resilient system. Any type of equipment can fail and Acquire will still continue to collect measurement data.
In fact, everything can fail apart from one flow computer and the fiscal integrity of the system will remain intact. Acquire will back gather all available flow computer reports once it comes back online.