GE PQMII, Инструкция по эксплуатации

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CHAPTER 3: OPERATION
PQMII POWER QUALITY METER – INSTRUCTION MANUAL 3–7
Press the
MESSAGE
keys when displaying a subgroup to access messages within that
subgroup. Otherwise select the
MESSAGE
keys to display the next subgroup.
FIGURE 3–4: Message Hierarchy Example
• Computer Entry : When running the EnerVista PQMII Setup Software, setpoint values
are accessed through the menu bar and displayed in a series of windows. See Chapter
4:
Software for further details.
• SCADA Entry : Details of the complete communication protocol for reading and writing
setpoints are given in 7.4: DNP 3.0 Communications . A SCADA system connected to the
RS485 terminals can be custom programmed to make use of any of the
communication commands for remote setpoint programming, monitoring, and
control.
3.3.9 Setpoint Access Security
The PQMII incorporates software security to provide protection against unauthorized
setpoint changes. A numeric access code must be entered to program new setpoints using
the front panel keys. To enable the setpoint access security feature, the user must enter a
value in the range of 1 to 999. The factory default access code is 1. If the switch option is
installed in the PQMII, a hardware jumper access can be assigned to a switch input.
Setpoint access can then only be enabled if the switch input is shorted and the correct
software access code entered. Attempts to enter a new setpoint without the electrical
connection across the setpoint access terminals or without the correct access code will
result in an error message. When setpoint programming is via a computer, no setpoint
access jumper is required. If a SCADA system is used for PQMII programming, it is up to the
programmer to design in appropriate passcode security.
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