WattNode WNC-3Y-208-MB, Инструкция по установке и эксплуатации

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Operating Instructions 47
register. Note: there are no minimum or maximum demand registers for DemandA , DemandB ,
and DemandC .
DemandMax
The DemandMax is the largest measured Demand . It is preserved across power failures and
can be reset with the ZeroDemand register.
DemandApp
DemandApp
is computed the same way as
Demand
, but using apparent power.
IO Pin Options
IoPinState, PulseCount
For details about the IO pin options registers and configuration, see the Continental Control
Systems website:
http://www.ccontrolsys.com/w/WattNode_Modbus_-_Option_IO .
Configuration Registers
ConfigPasscode (1601, 1602)
The WattNode Modbus meter has an optional configuration passcode to prevent unauthorized
changes to the configuration. As shipped from the factory, the
ConfigPasscode is set to “0”,
disabling the passcode. If a passcode is set, the meter must be unlocked by writing the correct
value to
ConfigPasscode before any configuration registers can be changed and before the
energy or demand registers can be reset to zero.
You can read the ConfigPasscode register to determine if the meter is locked. You cannot read
the actual passcode itself. If you lose your passcode, contact support for assistance.
●
0 - Unlocked
●
1
- Locked
Invalid unlock attempts will result in the Modbus exception 03 - “Illegal data value”, and prevent
more attempts for five seconds. An unlocked meter will become locked again after five minutes or
when “1” is written twice to
ConfigPasscode .
The passcode can be set (or changed) by writing the new passcode to ConfigPasscode twice
within 30 seconds. If a passcode is already set, the meter must be unlocked first.
Valid passcode values are:
●
0 - this disables the passcode.
● 2 to 2,147,483,647 - use at least six digits for a secure passcode.
The passcode is a 32 bit value, so both register locations 1601 and 1602 must be written when
unlocking the WattNode or setting a passcode.
CtAmps (1603)
Writing the CtAmps register is a shortcut to quickly set CtAmpsA , CtAmpsB , and CtAmpsC
to the same value. If you read CtAmps and CtAmpsA , CtAmpsB , CtAmpsC are all identical,
then CtAmps will return the common value; otherwise it will return 0 (zero) to indicate there is no
common value.
CtAmpsA, CtAmpsB, CtAmpsC (1604 , 1605, 1606)
The CT amps registers are integer registers in units of amps used to set the rated current of the
attached current transformers (CTs). This allows the use of different CTs on different input phases:
Ø A
,
Ø B
, and
Ø C
. Rated current is the 100% value; the current that results in a 0.33333 VAC
output from the CT.