Rockwell Automation 1440-SDM02-01RA XM-124 Standard Dynamic Measurement Module - Manuel (Page 53)

Rockwell Automation Publication 1440-UM001C-EN-P - May 2014 53
Install the XM-124 Standard Dynamic Measurement Module Chapter 1
Switch 2 - Normal/Legacy Mode
In most cases, the module must be left in Normal (default) mode. However, if the
module is used to replace an existing XM-12X module, and DeviceNet V+ is not
wired, then the mode must be set to Legacy.
Switches 3 and 4 - Set DeviceNet Communication Rate
These switches are ignored if switch #1 is in the on (1) position (switch disabled).
Use these switches to set the communication rate per the following table.
Switches 5…10 - Set DeviceNet Address
Follow these steps to set the node address.
1. Refer to DeviceNet Node Address table on page 55 for the switch settings
of a specific address.
IMPORTANT When DIP Switch #2 is set to Legacy mode (OFF), the XM 124 continues to
communicate even when DNet V+ is not present. If connections are
established when DNet V+ is restored, other XM modules do not perform a
Duplicate MAC Address check. Consequently if an address conflict exists it may
not be detected and erroneous data or unexpected behaviors including
potentially a BUS OFF condition can result.
IMPORTANT When DIP Switch #2 is set to Normal mode (ON), the XM-124 module behaves
per the DeviceNet standard and does not communicate when power is not
present on DeviceNet V+. At any time that power is detected on DeviceNet
V+ the XM-124 module performs a Duplicate MAC Address check and, in the
event that a module with a duplicate address is detected, terminates all
communication.
TIP Legacy mode is consistent with how previous XM modules, including the XM-
12x modules, behaved with respect to the presence of power on DeviceNet V+.
However, in both Legacy and Normal mode, an XM-124 module performs a
Duplicate MAC Address check when the module detects power applied to
DeviceNet V+. This is a change in behavior from earlier XM modules.
Communication Rate SW 3 SW 4
125 Kbps 0 0
250 Kbps 0 1
500 Kbps 1 0
Auto Communication 1 1