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6. APPLICATION FUNCTIONS
6.28 Dual port memory exclusive control
6.28.1 Summary
The dual port memory exclusive control function is a function that keeps the consistency of the memory data
by temporarily limiting the system program and user program to read/write data to the limited area of the dual
port memory.
6.28.2 Exclusive control of digital output
If the digital output signal is updated from the user program during controlling of the digital output signal by the
other axes start function, the consistency of the data may not be kept. Read/write the digital output signal using
the exclusive control function after controlling the possessory right of the digital output signal.
API LIBRARY
The sscSetDigitalOutputDataBit and sscSetDigitalOutputDataWord functions
of the API library perform exclusive control of digital output within the function.
(1) Interface
Address Abbreviation Description Detail (Note 1) User program data writing
EF80 DORH Digital output signal host occupy
request
0: No request
1: Request
EF82 DORB During digital output signal board
occupy request (Note 2)
0: No request
1: Request
EF84 DOCS Digital output signal occupy
selection
0: System program
1: User program
EF86
to
EF8F
Reserved
Note 1. When the data out of the range is written, the exclusive control error (system error E503) occurs, which stops
the import of the digital output signal and the control of the digital output signal by the other axes start function.
2. This is the area where the data can be written only from the system program. When the data is written from the
user program to this area, the exclusive control operates incorrectly.