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1-6 Micro PLC Programmer’s Guide – April 1994
GFK-0804B
Memory Types and Addresses
Memor y Map
Type Total Non
Retentive
Retentive
Use for Timer
or Counter
Coil?
General
Purpose
Internal Coil?
Use as
General
Purpose
Register?
Use as
Indirect
Register
Reference?
I
256 1 – 256 none no yes no no
O
256 1 – 256 none yes yes no no
R
512 1 – 384 385 – 512* no yes yes yes
IR
256 1 – 256 no not applicable not applicable yes no
OR
256 1 – 256 no not applicable not applicable yes no
C
1017 1 – 768 769 – 1017 yes yes no no
C
1 1018 0.1 sec clock for use as input in application program (read only).
C
1 1019 Startup scan coil for use as input in application program. (read only)
C
1 1021 Hold output coil for use in application program (read only).
Non-retentive and Retentive Registers
Data assigned to retentive memory is saved if power is removed from the Micro PLC.
Non-retentive registers are cleared to zero when power is removed, and when the
Micro PLC is switched from Stop mode to Run mode.
* Reserved Registers
Retentive Registers 501 through 512 should not be used in your application program;
they are reserved.
Constants and Register Values in a Program
Many program functions for the Micro PLC use either constants, or variables in registers.
Constant values are limited to 32757 maximum. Single-register variables are limited to
65535 maximum.