Delta AH500 - Basic Structure of I;O Storages; Relation between the PLC Action and the Device Type

AH500 Programming Manual
2-4
Type
Device name
Number of devices
Range
Index register
E
32
E0~E31
Constant*
Decimal system K
16 bits: -32768~32767
32 bits: -2147483648~2147483647
Hexadecimal system 16#
16 bits: 16#0~16#FFFF
32 bits: 16#0~16#FFFFFFFF
Single-precision
floating-point number
F 32 bits: ±1.17549435
-38
~±3.40282347
+ 38
Double-precision
floating-point number
DF
64 bits: ±2.2250738585072014
-308
~
±1.7976931348623157
+ 308
String*
String
“$”
1~31 characters
*1: The decimal forms are notated by K in the device lists in chapters 5 and 6, whereas they are
entered directly in ISPSoft, for example, for K50, simply input 50.
*2: The floating-point numbers are notated by F/DF in the device lists in chapters 5 and, whereas
they are represented by decimal points in ISPSoft, for example, for F500, simply input 500.0.
*3: The strings are notated by “$” in chapters 5 and 6, whereas they are represented by “ ” in
ISPSoft, for example, for “1234”, simply input 1234.
2.1.2 Basic Structure of I/O Storages
Device Function
Access of
bits
Access of
words
Modification
by ISPSoft
Forcing the bit
ON/OFF
X
Input relay
OK
OK
OK
OK
Y
Output relay
OK
OK
OK
OK
M
Auxiliary relay
OK
-
OK
-
SM
Special auxiliary
relay
OK - OK
-
S
stepping relay
OK
-
OK
-
T
Timer
OK
OK
OK
-
C
Counter
OK
OK
OK
-
HC
32-bit counter
OK
OK
OK
-
D
Data register
OK
OK
OK
-
SR
Special data
register
- OK OK
-
L
Link register
OK
OK
OK
-
E
Index register
-
OK
OK
-
2.1.3 Relation between the PLC Action and the Device Type
Device type
PLC action
Non-latched
area
Latched
area
Output relay
Power: OFF→ON
Cleared Retained Cleared
STOP
↓
RUN
The output relay is cleared.
Retained
Retained
Cleared
The state of the output
relay is retained.
Retained Retained Retained
The state of the output
relay returns to that before
the PLC’s stopping.
Retained Retained
The state of the output
relay returns to that before
the PLC’s stopping.
The non-latched area is
cleared.
Cleared Retained Cleared
The state of the latched
area is retained.
Retained Retained Retained