Specifications

Table 19: Bus Device Configuration List
Possible Values/Exception ValuesDescriptionLabel
Any name or numberDisplays 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.
Object Name
1 - 255Displays 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.
Address
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 FEC, FAC, IOM, and
VMA16 Series controllers. Other
devices may return a False value even
though they are mapped and appear
on the navigation tree.
Indicates whether devices are mapped to the
Metasys system.
Mapped
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.
Indicates whether the device responded to the
analyze bus poll.
Status
<127 indicates that the Max Master attribute
has been altered. See Parameters That Affect
MSTP Communication.
127 is the default value and indicates that the
device is configured.
255 indicates that the poll could not read the
Max Master attribute.
Displays the Max Master 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.
Max Master
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.
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.
Max Info Frames
51MS/TP Communications Bus Technical Bulletin: Appendix: Maximizing and Troubleshooting the MS/TP Bus