Omron SYSMAC C Series Operation Manual page 156

Specifications and General Information
Relationship with CPU
Unit
CPU Unit
Allocated I/O
words (2 or 4
words)
Memory Map
Address
When two words are allocated, the CPU Unit uses the I/O WRITE and I/O READ
instructions, WRIT and READ, to directly access RAM. When four I/O words are
allocated, the CPU Unit uses the MOV or OUT instruction to access RAM
through the allocated I/O words.
Ladder
WRIT in two-word
program
operating mode
READ
MOV or OUT in
four-word
operating mode
I/O refresh
I/O refresh
Memory Map in the Analog Output Unit consists of 62 words. It contains conver-
sion data, status flags, and parameter setting data.
Invalid Data Received Flags, Conversion Error Flags
Conversion data (corresponding to words 01 to 08)
Scaling Enabled Flags, Output Ramp Enabled Flags
Upper/Lower Limit Enabled Flags, BCD/Binary Mode Flags
Conversion Data Enabled Flags
Read Pointer
Scaling Enable Bits, Output Ramp Enable Bits
Upper/Lower Limit Enable Bits, BCD/Binary Mode Bits
Conversion Data Enable Bits
Conversion Speed Mode Setting
Scaling Lower Limits (for each point)
Scaling Upper Limits (for each point)
Output Ramp Set Times (for each point)
Output Upper/Lower Limits (for each point)
Invalid Data Received Address
Invalid Data Received Error Code
Total EEPROM Write Count
EEPROM Write Result
Total EEPROM Write Count Setting
Analog Output Unit
Special
Word 00
functions
such as
scaling
Parameter settings
Word 61
Data transferred
at startup
Data written to EEPROM
Allocated
I/O words
(2 or 4
words)
Section
8 analog
D/A
conver-
output points
sion
Status flags:
Analog Output Unit → CPU Unit
Conversion data:
Analog Output Unit ↔ CPU Unit
Status flags (for parameter
settings):
Analog Output Unit → CPU Unit
Pointer:
Analog Output Unit ↔ CPU Unit
Parameter settings:
CPU Unit → Analog Output Unit
Status data:
Analog Output Unit → CPU Unit
Analog Output Unit ↔ CPU Unit
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