Main properties for a Honeywell Universal Modbus channel

The unique name of the channel. A maximum of 10 alphanumeric characters (no spaces or double quotes). Note: In Station Experion's main operator interface. Station presents information using a series of displays. See also: display. displays, underscore characters ( _ ) appear as spaces.

(Optional) A description of the channel. A maximum of 132 alphanumeric characters, including spaces.

The Tag Name A unique identifier given to a point or an asset. Compare: item name. See also: asset, point. of the Asset to be associated with the controller Also known as remote terminal unit, RTU. A generic term for a device that is used to control and monitor one or more processes in field equipment. The most common control and monitoring device in an access control and security system is an access control panel. Other devices include security monitoring panels, elevator controllers, and fire monitoring devices. Controllers include programmable logic controllers (PLCs), loop controllers, bar code readers, and scientific analyzers. See also: C200 controller, control processor, CPM, hybrid controller, network node controller, PLC..

The communications alarm marginal limit at which the channel is declared to be marginal. When this limit is reached, a high priority alarm is generated. To change the priority of the alarm system wide, see the topic titled "Configuring system alarm priorities" in the Server and Client Configuration Guide. To change the priority of the alarm for one channel, see the topic titled "About configuring custom system alarm priorities for an individual channel or controller" in the Server and Client Configuration Guide.

A channel barometer monitors the total number of requests and the number of times the controller did not respond or response was incorrect. The barometer increments by two or more, depending on the error, and decrements for each good call.

To calculate an acceptable marginal alarm limit, use the formula In ISA-S88.01 terms, a category of recipe information that includes process inputs, process parameters, and process outputs. In Honeywell terms, the recommended implementation of a formula is through using Phase block formula and report parameters.: Square root of the number of controllers on the channel × Marginal Alarm Limit defined on those controllers (Normally, you specify the same value for all controllers on a channel).

For example, if there are 9 controllers on the channel and their Marginal Alarm Limit is set to 25, the value would be 3 (which is the square root of 9) × 25 = 75.

The communications alarm fail limit at which the channel is declared to have failed. When this barometer limit is reached, an urgent alarm is generated. To change the priority of the alarm system wide, see the topic titled "Configuring system alarm priorities" in the Server and Client Configuration Guide. To change the priority of the alarm for one channel, see the topic titled "About configuring custom system alarm priorities for an individual channel or controller" in the Server and Client Configuration Guide.

Set this to double the value specified for the channel Marginal Alarm Limit.

If the channel is on a serial port, the length of time (in milliseconds) that the server The computer on which the Experion database software and server utilities run. See also: Experion server TPS. waits before writing to the Port and the Redundant Port of any controller on the channel. The default value is 10 milliseconds for both the Port and the Redundant Port. You can set different values for these two ports.

For redundant HC900 Hybrid controller. networks, the suggested Write Delay is 0.

The time (in seconds) the server waits to connect to the Port and the Redundant Port of the controller before abandoning the connection. The default is 10 seconds for both the Port and the Redundant Port. You can set different values for these two ports.

Use the default values unless the communications lines have a high error rate or you are using modems.

For redundant HC900 networks, the suggested Connect Timeout is 1.

The time (in seconds) that the server waits for a reply from the Port and the Redundant Port of the controller. The default is 2 seconds for both the Port and the Redundant Port. You can set different values for these two ports.

Use the default values unless the communications lines have a high error rate or you are using modems.

For redundant HC900 networks, the suggested Read Timeout is 1.

The type of channel specified when this item was created.

The date and time the channel properties were modified.

The date and time the channel was last downloaded to the server.