Rockwell Automation 2711-K9A10_K9C10_T9A10_T9C10 DeviceNet Communications User Guide - Manual (Page 18)

18
Publication 2711-6.0.4
Field Description Valid Characters Notes
Tag Name
Name of tag Maximum characters=32
• A-Z, a-z, 0-9
• hyphen (-), underscore (_),
percent(%)
• if you type an invalid character, the Tag Editor
beeps and does not display it
• tag name must be unique within a project
• cannot begin with 0-9, hyphen (-), or percent
(%)
• tag names are not case-sensitive
• do not use blanks, tabs, carriage returns, non-
printable characters
Data Type Data format of tag Select one of the following:
• bit (Bool)
• 4BCD (16 bits)
• unsigned integer (16 bits)
• signed integer (16 bits)
• IEEE float (32 bits)
• bit array (size varies)
• character array (8 bits/char.) The data type must be compatible with the data
format selected in the object’s dialog.
Alternate Methods: Type the first letter of the data
type. For example, type b for bit data type. Use the
TAB key to move to the Data Type filed and press
ALT+
↓ to display the list of available formats.
Swap Bytes Displayed when
Character Array
data type selected. Check Box • when selected high and low data bytes swap
positions. Select swap bytes when data is sent
in the wrong order (high byte first). For
example, data from a PLC is sent with the 1st
character of a string in the 2nd byte. By
swapping the bytes, the 1st character is sent in
the 1st byte.
• Byte swapping is not generally used with
Explicit-Client messaging. These addressed
devices usually conform to DeviceNet
specifications and send data in the correct
sequence.
Swap Words Displayed when
Float data type
selected. Check Box • when selected high and low words of a floating
point value are swapped. This allows floating
point values generated by a PLC to be properly
displayed.
• word swapping is not generally used for
DeviceNet devices that generate floating point
values.
Message Type The message type. Additional fields are required for Explicit message
types.
Instance Number
(Explicit-Server
Message Only) Instance Number
from 3 to 16. 3 to 16 Instances 1 and 2 are automatically assigned to I/O
message types.
Node Address
(Explicit-Client
Message Only) Node address of
peer device. 0 to 63
Load from EDS
(Explicit-Client
Message only) Loads information
using the electronic
data sheet. Load parameter data from the data sheet for the
peer device. Otherwise, enter the tag information
(class, instance, attribute) from the sheet manu-
ally.
Write Tag
(Explicit-Client
Message only) Write tag data sent
to server device. Check box If Write Tag is not selected, tag is specified as a
read tag (data is read from server device).
Packet Bytes
(Explicit-Client
Message only) Number of bytes in
each message
packet. 1 to 128 This value must match the amount of data in the
attribute addressed in the external server device.
Refer to appendix A.