GE GFK-0804B 用户手册
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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
Purpose
Internal Coil?
Use as
General
Purpose
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.
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.
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.
Constant values are limited to 32757 maximum. Single-register variables are limited to
65535 maximum.