Rockwell Automation 57C423 Common Memory Module - Manual (Page 30)

CĆ2
Appendix C
(Continued)
1000 NVMEMDEF WINDOW%, STOPPB@
The NVMEMDEF statement also allows you to define array variables. The
following example defines an array of 20 (0Ć19)singleĆprecision integers with the
name SIZES%".
1650 NVMEMDEF SIZES%(19)
Common Memory Module Located in Any
Even Slot Other Than 0
This section describes how to configure the Common Memory module when it is
located in any even slot other than 0. In this situation the Common Memory
module provides userĆconfigurable data storage only. In other words, you can
specify the exact address at which to store data.
The slot to the right of the Common Memory module must be empty because the
module contains 64K userĆconfigurable registers, or the equivalent of the address
space of two slots. Therefore, if the Common Memory module is placed in slot 6,
the first 32K registers are addressed as slot 6. The second 32K registers are
addressed as slot 7. Refer to the figure below.
SLOT 6 SLOT 7
Register 0 Register 0
Register 32767 Register 32767
Common
Memory
Module
Empty
Slot
64K Registers
(128K Bytes Memory)
32 Bit Register Reference Format
Use the following method to reference 32 bits of data as a single value. One
statement is required in the configuration task for each variable. The symbolic
name of each value should be as meaningful as possible:
nnnnn IODEF SYMBOLIC_NAME![ SLOT=s, REGISTER=r]
When referenced as a double precision integer of 32 bits, register r" is the high
order 16 bits and register r+1" is the low order 16 bits.