Installation manual

Publication 1747-RM001G-EN-P - November 2008
SLC Communication Instructions 12-53
Parameters for Target Device on the General Tab
• 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 to 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.
• DeviceNet Addr (dec)
The target DeviceNet node address. Valid range is 0 to 63. If you enter
in the local scanner’s DeviceNet node address, the command is
executed by the local scanner.
• Service
This pulldown lets you select services based on name rather than Service
Code. The Custom service allows you to enter in any Service Code in
the hexadecimal range of 1 to 7F. The services listed in the pulldown
selection 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.
• Service Code (hex)
This field is read-only unless the Custom Service is selected. Possible
Service Codes are 1 to 7F (hex). See Volume 1 of the CIP Common
Specification, Appendix A, for the list of valid explicit messaging Service
Codes.