OMRON C500-PRW06 PROGRAMMABLE CONTROLLER

OMRON C500-PRW06

Data in the DM Area is retained when the PLC’s power is cycled or the PLC’s

operating mode is changed from PROGRAM mode to RUN/MONITOR mode

or vice-versa.

Although bits in the DM Area cannot be accessed directly, the status of these

bits can be accessed with the BIT TEST instructions, TST(350) and

TSTN(351).

Bits in the DM Area cannot be force-set or force-reset.

Indirect Addressing

DM Area Allocation to

Special I/O Units

.

Words in the DM Area can be indirectly addressed in two ways: binary-mode

and BCD-mode.

Binary-mode Addressing (@D)

When a “@” character is input before a DM address, the content of that DM

word is treated as binary and the instruction will operate on the DM word at

that binary address. The entire DM Area (D00000 to D32767) can be indi

rectly addressed with hexadecimal values 0000 to 7FFF.

@D00100

0100

D00256

Address actually used.

BCD-mode Addressing (

D)

When a “*” character is input before a DM address, the content of that DM

word is treated as BCD and the instruction will operate on the DM word at that

BCD address. Only part of the DM Area (D00000 to D09999) can be indirectly

addressed with BCD values 0000 to 9999.

D00100

Address actually used.

Parts of the DM Area are allocated to Special I/O Units and CPU Bus Units for

functions such as initial Unit settings. The timing for data transfers is different

for these Units, but may occur at any of the three following times.

1. Transfer data when the PLC’s power is turned ON or the Unit is restarted.

2. Transfer data once each cycle.

3. Transfer data when required.

Refer to the Unit’s operation manual for details on data transfer timing.

Special I/O Units (D20000 to D29599)

Each Special I/O Unit is allocated 100 words (based on unit numbers 0 to 95).

Refer to the Unit’s Operation Manual for details on the function of these

words.

CPU Bus Units (D30000 to D31599)

Each CPU Bus Unit is allocated 100 words (based on unit numbers 0 to F).

Refer to the Unit’s Operation Manual for details on the function of these

words. With some CPU Bus Units such as Ethernet Units, initial settings must

be registered in the CPU Unit’s Parameter Area; this data can be registered

with a Programming Device other than a Programming Console