Table 14:
Setting columns in the Modbus Communication Management tool in PCM600
Setting column
Alternatives
Description
Register address
Not adjustable
The 3x and 4x Modbus memory
map addresses where the
register resides as default. If the
field is empty, the register is not
visible in the Modbus memory
map as default. The register can
always be further mapped into
the user-definable area.
Data category
0
1)
Register does not belong to any
data category group.
1...16
Register belongs to data
category group number N. If any
object belonging to this group
changes its value, bit (N-1) in
SSR3 gets the value 1. The
SSR3 bit value is automatically
reset when master reads it.
Primary scale factor in use
Unchecked
1)
In case of current and voltage
values, the value is now a PU
(Per Unit) value, where 1.0
corresponds to 1.0 × Nominal
value.
Checked
In case of current and voltage
values, the value is now a
primary value, based on the
configured CT and VT ratio
values. Current is in [A] and
voltage is in [kV].
Scale
Any real value
Modbus value is scaled as Value
× Scale + Offset. The result is a
correctly rounded integer value.
If the Modbus value exceeds the
register size limit after the
scaling, then it saturates at the
register max value.
Offset
Any real value
1) Default setting
The
Primary scale factor in use
setting has a meaning only for values that are related
to current or voltage measurements. Usually the check box should be visible only for
these kinds of values. In case the setting occurs for another type of value, it does not
affect the source value.
The primary scale factor setting cannot be applied afterwards in the user-definable
register. The setting must be done at the source register value, and the UDR setting
Scale value format
must be configured as “Regular Modbus register value”.
3.4.6
Control operations
The IED's outputs can be controlled either through the 0X coil objects or 4X holding
register control structures. See the Modbus control objects' memory map for the
available control objects.
1MRS757645 B
Section 3
Vendor-specific implementation
620 series
31
Communication Protocol Manual
