Rockwell Automation 1747-SDN SLC 500 DeviceNet Scanner Module User Manual - Manual (Page 95)

Publication 1747-UM655B-EN-P - June 2007
DeviceNet Explicit Messaging 95
Parameters for Target Device on the General Tab
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Message Timeout(x1 sec)
The amount of time in seconds that the processor will wait for a
reply from the scanner to the explicit message command. Range
is 0, 2…255. Like the Message Timeout in a standard MSG
instruction, a value of 0 disables the Message Timeout and a
value of 1 second gets bumped to 2 seconds upon instruction
execution. If the built-in Message Timeout is disabled,
user-programmed timeout logic must be included to avoid a
message lockup in the case where a reply is lost.
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DeviceNet Addr (dec)
The target DeviceNet node address. Valid range is 0…63. If you
enter in the local scanner’s DeviceNet node address, the
command is executed by the local scanner.
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Service
This pull-down menu lets you select services based on name
rather than Service Code. The Custom service lets you enter in
any Service Code in the hexadecimal range of 1…7F. The
services listed in the pull-down menu are:
– Read Assembly.
– Write Assembly.
– Write Output Point.
– Read Output Point.
– Read Input Point.
– Read Parameter.
– Write Parameter.
– Read Analog Input.
– Write Analog Output.
– Generic Get Attribute Single.
– Generic Set Attribute Single.
– Reset Identity Object.
– Custom.
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Service Code (hex)
This field is read-only unless the Custom Service is selected.
Possible Service Codes are 1…7F (hex).
See Volume 1 of the CIP Common Specification, Appendix A, for
the list of valid explicit messaging Service Codes.