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model 2000 DeviceNet Module Manual (DN611/DN611A)
Chapter 4 Operating Procedures for the DN611 (Software)
4
4.2.4 Semaphore area
This area is used to issue requests from the S controller for operating the DN611 in a
specific way, or for reading the DN611's response to a request. The addresses shown in
Figure 4-14 are the word addresses as viewed from the S controller.
Figure 4-14 Semaphore Area Configuration
(1) Request register (03FFH: 1 word): S controller →
→→
→ DN611
This register is used to notify the DN611 of a request, if issued by the S controller.
After writing "1" in the request flag register, the S controller ladder program writes
"256(0100H)" in this register.
0: No notice.
256: Notice
After reading a request in the request area, the DN611 sets this register to "0."
(2) Request flag register (03FDH: 1 word): S controller →
→→
→ DN611
This register is used to issue a request from the S controller to the DN611. After
writing request data in the request area, the S controller ladder
program writes "1" in this register.
0: No request.
1: A request is issued from the S controller to the DN611
Other than 0 and 1: Reserved
The DN611 sets this register to "0" after reading a request in the request area.
(3) Acknowledgement flag register (03FCH: 1 word): DN611 →
→→
→ S controller
This register is used to notify the S controller of the DN611's response after the S
controller issues a request to the DN611.
02CFH Reserved (1 words)
02D0H
Acknowledgement area (100 words)
0334H
Request area (200 words)
03FCH Acknowledgement flag register (1 word)
03FDH Request flag register (1 word)
03FEH Reserved (1 words)
03FFH Request register (1 word)
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