Datalogic Controller SC6000 Installation Manual download pdf (Page 57)

REDUNDANT SYSTEMS

Role Conflicts

A role conflict may occur under various circumstances. In the event of a role conflict an

automatic negotiation will lead to the automatic correction of the configuration and definition

of the correct roles.

Configuration

If compared with a stand-alone station, no additional settings are needed on the slave

scanners when the REDS function is used. All the parameters related to REDS function have

to be set on the active SC6000 as described in par. 6.4.1. Once this is done, a simple

procedure is needed to align the reserve SC6000 (see par. 6.4.2).

Topology Parameters

Two important configuration parameters are defined in the SC6000s to manage a Redundant

System:

TOPOLOGY REDUNDANCY ROLE

(values: Working/Protecting): this parameter is operator assigned and strictly connected to

the Lonworks address of the controller (0: Working, 63: Protecting). It represents the role

statically assigned to a controller: “Working” for the main controller and “Protecting” for the

reserve controller.

REDUNDANCY ROLE

(values: Active/Standby): this parameter is read-only and represents the role that the

controller dynamically plays in the redundant system at a certain moment.

When TOPOLOGY REDUNDANCY ROLE is set to “Working”, REDUNDANCY ROLE is set to

“Active” by default.

When TOPOLOGY REDUNDANCY ROLE is set to “Protecting”, REDUNDANCY ROLE is set to

“Standby” by default.

IP Addresses

The companion controllers have different IP address values and the parameter tree of each

controller contains the IP addresses of both of them. In order to manage the interface to any

external host computer (WebSentinel PC, Genius™ PC or generic host) when a switch over

occurs, two separate policies have been defined to select the IP address when switching

over:

if the parameter IP Address Selection Rule is set to Topology Role (W/P), the IP address

seen by the external host changes after switching over (the topology role is static).

if the parameter IP Address Selection Rule is set to Redundancy Role (A/S), the IP

address seen by the external host remains unchanged after switching over.

It must be noted that the IP Address Selection Rule is unique for all the possible external

hosts (WebSentinel PC, Genius™ PC or generic host).

1 2 ... 52 53 54 55 56 57 58 59 60 61 62 ... 77 78

No comments

Datalogic Controller SC6000 Installation Manual Page 57