
B-64044EN/01 SETTING 1.DeviceNet FUNCTIONS
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Simultaneousness of data
When DI data or DO data is handled with the ladder program, the
simultaneousness of long data (4-byte data) and word data (2-byte
data) is guaranteed (there is no data spikes) under the corresponding
constraints.
CAUTION
If the following constraints are not satisfied, the
simultaneousness of long data or word data is not
guaranteed.
Simultaneousness of long data (4-byte data)
To guarantee the simultaneousness of data, satisfy the following two
conditions.
<1> In the ladder program, the following commands are used in units
of four bytes.
Commands : DECB, CODEB, DCNVB, COMPB, DSCHB,
XMOVB, ADDB, SUBB, MULB, NUMEB,
MOVN, EOR, AND, OR, NOT
<2> When DI data or DO data is assigned to the R address or E
address of PMC, the R address or E address is aligned with
4-byte boundaries.
Example) 1:R0000, 2:R0004, 3:R0008, 1:E0000
Simultaneousness of word data (2-byte data)
To guarantee the simultaneousness of data, satisfy the following two
conditions.
<1> In the ladder program, the following commands are used in units
of two bytes.
Commands : DECB, CODEB, DCNVB, COMPB, DSCHB,
XMOVB, ADDB, SUBB, MULB, NUMEB,
MOVN, EOR, AND, OR, NOT
<2> When DI data or DO data is assigned to the R address or E
address of PMC, the R address or E address is aligned with
2-byte boundaries.
Example) 1:R0000, 2:R0002, 3:R0004, 1:E0002
Simultaneousness of byte data (1-byte data)
There are no special constraints. The simultaneousness is always
guaranteed in 1-byte data.