Indirectly Addressing The Dm And Em Areas - Omron CQM1H - PROGRAM Programming Manual

Programmable controllers; inner boards

Table of Contents

Indirectly Addressing the DM and EM Areas

Direct Addresses

Indirect Addresses

The DM and EM areas can be addressed either directly or indirectly. Indirect

addresses are indicated using an asterisk before the address, e.g., *DM

When IR 00000 is ON, the constant FFFF is moved to DM 0000.

With indirect addresses, the contents of the address given in the operand is

treated as BCD and used as the final address in the EM or DM area.

When IR 00000 is ON, the constant FFFF is moved to the address

specified in DM 0000, i.e., DM 0123.

Note The contents of a word used as an indirect must be BCD and must not exceed

the addressing range of the DM or EM area. If it is not BCD, a BCD error will

occur. If the DM or EM area is exceeded, an indirect addressing error will

occur. The Error Flag (SR 25503) will turn ON for either of these errors and

the instruction will not be executed.

Table of Contents