Eaton easy800 Manual page 112

4 Wiring with 800
4.4 Circuit diagram elements
108
Control Relay easy800 11/11 MN04902001Z-EN www.eaton.com
Table 14: Conversion table M, MB, MW, DW
Searched for
Bit (M)
Byte (MB)
Word (MW)
Double word (DW)
easy800 standard : n = 1 to 96
easy800-SWD: n = 1 to 128
Example 1: given Bit81 = M81; n = 81;
Byte(MB) = n/8 = 10.125 ≈ 11
•
Word(MW) =n/16 = 5.0625 ≈ 6
•
Double word(DW) = n/32=2.5313 ≈ 3
•
Bit81 is contained in MB11, MW6 and DW3.
Example 2: given Byte21=MB21; n = 21;
• Bit(M) = 8n-7 to 8n = Bit161 to 168
Word(MW) = n/2 = 10.5 ≈ 11
•
Double word(DW) = n/4=5.25 ≈ 6
•
Byte21 contains the bits Bit161 to Bit168. Byte21 is contained in MW11 and
DW6.
Marker bit (M), marker bytes (MB), marker words (MW) and marker double
words (MD) are used in the circuit and function block diagram.
Expansion units for analog value measuring can be used on easy800
standard devices from device version number 04. The analog inputs and
outputs of the expansion units are read or written via permanently assigned
marker words:
given Bit Byte
M n MB n
8n-7 to
8n
n
8
n n
16 2
n n
32 4
Word Double
word
MW n
DW n
16n-15 32n-31
to 16n up to
32n
2n-1 to 4n-3
2n to 4n
2n-1
to 2n
n
2