The Parameter-Mirror logical device ties a single parameter of two 1:1 redundant devices together. Any time the parameter is changed at the primary device, the Parameter-Mirror copies this setting to the spare device. The Parameter-Mirror itself provides no redundancy control or switching, it is intended to be used as an extension of an existing redundancy switching unit.
The Parameter-Mirror works symmetrically, there is no fixed definition of a primary and a spare device. To determine it's working direction, the Parameter-Mirror monitors a switch position. This switch position may be an arbitrary M&C parameter, hence a hardware switch may be monitored as well as the output state of a software based redundancy control. Accordingly, the redundancy controller may be both, a sat-nms logical device or an external hardware unit.
Mirroring the parameter usually only is desired while the redundancy / protection switch is activated. The Parameter-Mirror monitors a second parameter, which enables mirroring. This usually is the ON/OFF setting of the redundancy controller. While the Parameter-Mirror is disabled by this parameter, no mirroring of settings takes place. However, the Parameter-Mirror monitors the parameter setting at both devices and remembers them in an internal memory. Once the redundancy switch is enabled, the Parameter-Mirror copies the setting of the primary device to the spare one.
Device window pages
The following table shows which device window pages are available with this individual device type. Tool-bar functions not mentioned here are described at the general description of device windows .
--- The device info page.
--- The maintenance page. The configuration parameters from this page are described below.Configuration parameters
At the maintenance page of the device window there are a couple of configuration parameter which must be set to interconnect the Parameter-Mirror device with the devices it shall mirror.
| parameter | description |
|---|---|
| enableId | Enter the message identifier here of the parameter the Parameter-Mirror shall monitor in order to enable / disable the mirroring function. (e.g. "PROTECT.enable") |
| enableVal | This is the message contents, the Parameter-Mirror expects to enable the mirroring. (e.g. "ON") |
| directionId | Enter the message identifier here of the switch position which determines the direction of the mirroring function. (e.g. "S2.position") |
| direction1To2Val | This is the message contents, the Parameter-Mirror expects to mirror from device 1 to device 2. (e.g. "A") |
| parameter1Id | The message identifier of the parameter 1 to mirror. |
| parameter2I | The message identifier of the parameter 1 to mirror. |
Variables defined by this device driver
| name | type | flags | range |
|---|---|---|---|
| info.driver | TEXT | R/O | StringRange R/O |
| info.type | TEXT | R/O | StringRange R/O |
| info.frame | TEXT | R/O | StringRange R/O |
| info.enableVal | TEXT | R/O | StringRange R/O |
| info.direction1To2Val | TEXT | R/O | StringRange R/O |
| info.forward1to2 | BOOLEAN | R/O | BooleanRange R/O (true false) |
| info.forward2to1 | BOOLEAN | R/O | BooleanRange R/O (true false) |
| config.enableId | TEXT | SAVE SETUP | StringRange |
| config.enableVal | TEXT | SAVE SETUP | StringRange |
| config.directionId | TEXT | SAVE SETUP | StringRange |
| config.direction1To2Val | TEXT | SAVE SETUP | StringRange |
| config.parameter1Id | TEXT | SAVE SETUP | StringRange |
| config.parameter2Id | TEXT | SAVE SETUP | StringRange |