Analyze Field Bus command - Metasys - LIT-12011034 - General System Information - Metasys System - Release 11.0

MS/TP Communications Bus Technical Bulletin
Product
Building Automation Systems > Building Automation Systems > Metasys System
Document type
Technical Bulletin
Document number
LIT-12011034
Version
Release 11.0
Revision date
2022-02-07

The Analyze Field Bus command provides detailed information about the devices that currently reside on the local or remote MS/TP bus. The command tells the network engine to poll each address on the FC bus, in order from 1 to 254. The polling takes several minutes to complete. Once it finishes, the Bus Analysis Progress attribute reads Complete and the Bus Device Configuration List displays each device on the bus.

Note: To use the Analyze Field Bus command on a Remote Field Bus, at least one of the MS/TP equipment controllers must be a Metasys equipment controller.

This command attempts to show the address, make, and other attributes of each device on the bus. You can use this information to identify devices you are unaware of and to identify third-party devices on the bus. The results of the scan can vary depending on the device type and manufacturer of the devices on the bus.

To issue the Analyze Field Bus command:

  1. Right-click the MS/TP Field Bus Integration object in the navigation tree and select Commands from the pop-up menu. The Select Command dialog box appears.

  2. Select Analyze Field Bus and click Send. The Bus Analysis Progress attribute value changes to In Progress.

  3. After the Bus Analysis Progress changes to Complete, read the devices from the Bus Device Configuration List drop-down menu using Table 1.

Figure 1. Bus device configuration list example

Table 1. Bus device configuration list

Label

Description

Possible values/exception values

Object name

Displays the name of the field device. The name is derived from following in this order:

  1. If the field device appears in the navigation tree, the name on the tree is used initially.
  2. If the device is communicating on the field bus, its name is read directly and overwrites the current name.
  3. If the device does not appear on the navigation tree and it is communicating, but its name cannot be read, the field is left blank.

Any name or number

Address

Displays the MS/TP address of a device if the device appears in the navigation tree or the device responds to the analyze field bus command poll.

1 – 255

Mapped

Indicates whether devices are mapped to the Metasys system.

True indicates that the device is mapped and appears on the navigation tree. False indicates that the device is not mapped and does not appear on the navigation tree.

Note: Currently, the Device Mapped label only applies to the CGM, CVM, XPM, FAC, FEC, VMA and IOM Series controllers. Other devices may return a False value even though they are mapped and appear on the navigation tree.

Status

Indicates whether the device responded to the analyze bus poll.

Responding indicates that the device responded to the poll. No Response indicates that the device appears in the navigation tree but did not respond to the poll.

Max Manager

Displays the Max Manager attribute of the device. If the device is configured, the default value is 127. If the attribute cannot be read, the value displayed is 255.

<127 indicates that the Max Manager attribute has been altered. See Parameters that affect MS/TP communication.

127 is the default value and indicates that the device is configured.

255 indicates that the poll could not read the Max Manager attribute.

Max Info Frames

Displays the Max Info Frames attribute of the device. If the device is configured, the default value is 10. If the attribute cannot be read, the value displayed is 255.

10 is the default value and indicates that the device is configured.

255 indicates that the poll could not read the Max Info Frames attribute.

Code State

Indicates the state of the operating code within Johnson Controls field devices. This field is meaningful only for Johnson Controls field devices.

Boot indicates that the device is starting and is not completely functional.

Main indicates that the device is functional and operating.

Unknown indicates that the device is not responding or does not support the Code State attribute.

EOL

Displays the end-of-line termination status of a Metasys CGM, CVM, FAC, FEC, VMA, IOM, and XPM.

True indicates the Metasys device EOL switch is On.

False indicates the Metasys device EOL switch is Off.

Note: All other devices on the bus display False regardless of the status of their EOL status.