Table 25:
Configuration columns in Modbus Communication Management tool in PCM600
Setting column
Alternatives
Description
Initial properties
Scale value format
Regular Modbus register
value
1)
UDR value initially inherits
scaling from the source Modbus
register. This includes the
source value
Primary scale in
use setting. If checked, the value
is automatically presented as a
primary value, according to the
system CT and VT ratio settings.
DA value from system level
UDR value is initially the same
as the IEC 61850 value received
from system level. For current
and voltage measurements this
means PU value (1.0
corresponds to 1.0 × nominal
value).
UDR register size (v2)
Same as the source register
1)
If the Modbus source register is a
16-bit register, then the UDR
register is automatically also 16-
bit. This principle applies to 32-
bit registers, too.
16-bit
UDR register is forced to 16-bit,
regardless of the source register
size.
32-bit
UDR register is forced to 32-bit,
regardless of the source register
size.
UDR register type
Same as the source register
1)
If the Modbus register is an
unsigned register, also the UDR
register is unsigned. This
principle applies to signed
source registers, too.
Unsigned
The value is interpreted as a
positive value only.
Signed
The value is interpreted as a
signed two's complement value.
Rescaling
Table continues on next page
Section 3
1MRS757645 B
Vendor-specific implementation
46
620 series
Communication Protocol Manual
