3 Data Exchange with the CPU Unit
3-10
CJ-series PROFIBUS Slave Unit Operation Manual for NJ-series CPU Unit (W510)
Device variables for CJ-series Units are variables for which AT is specified for the I/O port explained
below. The user program uses device variables for CJ-series Units to access the Configuration for a
unit such as the CJ1W-PRT21.
For allocation of the device variables for CJ-series Unit to the I/O port, refer to How to Create Device
Variables for CJ-series Unit on page 11.
These variables are used to set this Unit and reference statuses from a user program.
Device Variables for CJ-series Unit are positioned internally in the CPU Bus Unit words allocated in
CIO/DM areas shown below.
• CPU Bus Unit words allocated in CIO area (software switches, statuses)
• CPU Bus Unit words allocated in DM area (configuration information)
I/O Port
An "I/O port" is a logical interface for data exchange by a CPU Unit with a PROFIBUS Slave Unit or
other Configuration Unit.
An I/O port has a unique pre-defined name for each unit model and function.
An I/O port is automatically created by preparing the Unit Configuration with Sysmac Studio.
For details on the I/O ports defined for PROFIBUS Slave Unit, refer to 3-6 Device Variables for CJ-
series Unit (Software Switches, Statuses) and 3-7 Device Variables for CJ-series Unit (Configura-
tion).
Software Switches, Status Area
Software switches (execution instructions of each function from the CPU Unit to the PROFIBUS
Slave Unit) and statuses are allocated.
They are allocated in the memory used for CJ-series Unit according to the machine number as
shown below.
Allocated CIO words (Start address CIO Area = 2000 + MACH No. x 10)
Allocated DM words (Start address DM Area = 20000 + MACH No. x 100):
Device Variables for CJ-series Unit
MACH No. CIO Area MACH No. CIO Area
00 CIO 2000 to CIO 2009 06 CIO 2060 to CIO 2069
01 CIO 2010 to CIO 2019 07 CIO 2070 to CIO 2079
02 CIO 2020 to CIO 2029 08 CIO 2080 to CIO 2089
03 CIO 2030 to CIO 2039 09 CIO 2090 to CIO 2099
04 CIO 2040 to CIO 2049 10.. CIO 2100 to CIO 2109
05 CIO 2050 to CIO 2059 ..95 CIO 2940 to CIO 2949
MACH No. CIO Area MACH No. CIO Area
00 DM 20000 to DM 20007 06 DM 20600 to DM 20607
01 DM 20100 to DM 20107 07 DM 20700 to DM 20707
02 DM 20200 to DM 20207 08 DM 20800 to DM 20807
03 DM 20300 to DM 20307 09 DM 20900 to DM 20907
04 DM 20400 to DM 20407 10.. DM 21000 to DM 21007
05 DM 20500 to DM 20507 ..95 DM 29500 to DM 29507
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