12 Appendix
12.10 Memory requirement
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Control Relay easy800
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12.9.2 Function block output (operands)
12.9.3 Other operands
12.10 Memory requirement
The following table serves as an overview of the memory requirement of the
for rungs, function blocks and their associated constants.
Output
Meaning of
abbreviation
Description
D1…D8
Data 1…8
Output values
QN
Output Number
Number of table entries present, 0…16
QV
Output Value
Output value
Other
operands
Meaning of
abbreviation
Description
MB
Marker byte
8-Bit value
IA
Input Analog
Analog input (if available on device!)
MW
Merker Word
16-Bit value
QA
Output Analog
Analog output (if present on device!)
MD
Marker Double Word
32-Bit value
NU
NUmber
Constant, value range from –2147483648 to +2147483647
￫
Avoid empty rungs dispersed between written rungs after
operands have been deleted. These kinds of empty rungs take
up just as much space as a written rung.
Space requirement per rung/
function block
Space requirement per
constant at function block input
Byte
Byte
Rung
20
–
Function blocks
A
68
4
AR
40
4
BC
48
4
BT
48
4
BV
40
4
C
52
4
CF
40
4
CH
52
4
CI
52
4
CP
32
4
