Maple Systems MAPware-7000 - Manual (Page 298)

298 MAPware-7000 Programming Manual
1010-1040, Rev. 02
I/O Configuration
Registers MW0000 or
MW0000_00 0-3100, 0-
15 Bit or Register
(2 bytes)
Read/Write IO registers for base
expansion modules Note:
IO Coils and IO Registers
share same memory
System Coils S00000 0-99 Bit Only Read/Write Status and control bits
for HMC
System Registers SW0000 or
SW0000_00 0-255,
0-15
Bit or Register
(2 bytes)
Read/Write Status and control
registers for HMC
Internal Coils B00000 0-4095 Bit Only Read/Write General Purpose Internal
Coils
Internal Registers BW0000 0-255 Register Only
(2 bytes)
Read/Write General Purpose Internal
Registers
Note: Internal Coils and
Internal Registers share
same memory
Data Registers D00000 or
D00000_00 0-4095, 0-
15 Bit or Register
(1, 2 or 4 bytes)
Read/Write General Purpose
Registers
Retentive Registers R00000 0-1399
2
Register Only
(1, 2 or 4 bytes)
Read/Write Non-volatile memory
registers
1 – The HMC7030 supports C.0000-C.0099
2 – The HMC7030 supports R0-R299
Note: Memory areas are accessible in the Tag Database under Node Name: [Operator Panel] None (-)
Generally speaking, the entire memory area of the HMC can be used for any purpose. However,
the memory is split into several classifications so that they can be used for special purposes.
Index Registers (I, J, K)
The HMC7000 Series has three 16-bit index registers (I, J, and K) that perform a specific purpose.
As the name implies, these registers are used to ‘index’ or act as pointers to multiple registers.
This method is called ‘indirect addressing’ because the HMC7000 does not read/write to the
specified address directly. Instead, the target address is determined indirectly by referencing
the base address and the value read from the index register.
For example, if the MOV WORD instruction is used in a Ladder Logic Block, you can assign an
index register to one of the operands: