Basic Structure Of I/O Storages; Relation Between The Plc Action And The Device Type - Delta AH500 Programming Manual

AH 5 00 Pr ogr am m ing Ma n ua l
Type Device name
Index register
Decimal system
Hexadecimal system
Constant*
Single-precision
floating-point number
Double-precision
floating-point number
String* String
*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
X Input relay
Y Output relay
M Auxiliary relay
Special auxiliary
SM
relay
S
stepping relay
T Timer
C Counter
HC 32-bit counter
D Data register
Special data
SR
register
L
Link register
E Index register

2.1.3 Relation between the PLC Action and the Device Type

Device type
PLC action
Power: OFF→ON
The output relay is cleared.
The state of the output
relay is retained.
The state of the output
STOP
relay returns to that before
↓
the PLC's stopping.
RUN
The non-latched area is
cleared.
The state of the latched
area is retained.
2 - 4
Number of devices
E 32
16 bits: -32768~32767
K
32 bits: -2147483648~2147483647
16 bits: 16#0~16#FFFF
16#
32 bits: 16#0~16#FFFFFFFF
F 32 bits: ±1.17549435
64 bits: ±2.2250738585072014
DF
±1.7976931348623157
"$" 1~31 characters
Access of Access of
bits words
OK OK
OK OK
OK -
OK -
OK -
OK OK
OK OK
OK OK
OK OK
- OK
OK OK
- OK
Non-latched
area
Cleared
Retained
Retained
Retained
Cleared
Retained
E0~E31
-38
~±3.40282347
-308
~
+ 308
Modification Forcing the bit
by ISPSoft
OK
OK
OK
OK
OK
OK
OK
OK
OK
OK
OK
OK
Latched
Output relay
area
Retained Cleared
Retained Cleared
Retained Retained
The state of the output
Retained relay returns to that before
the PLC's stopping.
Retained Cleared
Retained Retained
Range
+ 38
ON/OFF
OK
OK
-
-
-
-
-
-
-
-
-
-