Switch Settings - Omron CS1W-PRM21 Operation Manual

Unit Components
2-1-3

Switch Settings

Setting the Unit Number
Unit Number and CPU Bus
Unit Word Allocations
26
The unit number is used to identify individual CPU Bus Units when more than
one CPU Bus Unit is mounted to the same PLC. The unit number must be
unique for each CPU Bus Unit. Selecting a non-unique number for a CPU Bus
Unit will prevent the PLC System from starting correctly.
CS1W-PRM21
UNIT
No.
1. Turn OFF the power supply before setting the Unit number.
2. Set the switch to the new Unit number. Use a small screwdriver to make
the setting, taking care not to damage the rotary switch. The unit number
is factory-set to 0.
3. Turn ON the power again.
Note Always turn OFF the power to the PLC CPU before changing the Unit number
setting. The Unit only reads the Unit number setting during the initialization
following a power-up, but not following a software reset.
Note If the unit number is being set for the first time or changed, then an I/O table
must be created for the PLC.
With CS/CJ-series PLCs, words are automatically allocated in the CIO Area
and the DM Area. The PROFIBUS-DP Master Unit uses these words for
receiving control data from the CPU Unit and for notifying the CPU Unit of
PROFIBUS-DP Master Unit and communications status. The word addresses
in the allocated areas for the CPU Bus Unit are important when creating the
user program for using the PROFIBUS-DP Master Unit. This must be consid-
ered when setting the unit number.
The CIO and DM Word allocations are discussed in detail in 4-2 Allocated
CIO Area Words . The tables below show the relation between the unit num-
ber and the allocated CIO Area and DM Area words.
Unit No.
(decimal)
0 (0) CIO1500 to CIO1524
1 (1) CIO1525 to CIO1549
2 (2) CIO1550 to CIO1574
3 (3) CIO1575 to CIO1599
4 (4) CIO1600 to CIO1624
5 (5) CIO1625 to CIO1649
6 (6) CIO1650 to CIO1674
7 (7) CIO1675 to CIO1699
CJ1W-PRM21
UNIT
NO.
Allocated words
(decimal)
8 (8)
9 (9)
A (10)
B (11)
C (12)
D (13)
E (14)
F (15)
Section 2-1
Setting range:
0 ~ F (Hexadecimal)
Unit No. Allocated words
CIO1700 to CIO1724
CIO1725 to CIO1749
CIO1750 to CIO1774
CIO1775 to CIO1799
CIO1800 to CIO1824
CIO1825 to CIO1849
CIO1850 to CIO1874
CIO1875 to CIO1899