Control Scenario; Communication Port Setup - Emerson VILTER MicroVission Operation And Service Manual

Appendix C • Remote Control and Monitoring
Figure C - 8. Analog Auxiliary Input (Remote Capacity %) Settings- Calibration Screen

Control Scenario

Once the Configuration Screen has been configured for
the desired type of Digital I/O control, the MicroVission
needs to be placed in REMOTE mode. To do this, press
the green color START button on the main page, and
then the REMOTE button.
The Remote Start-Stop input is now active. The state of
the Remote Enable Output should be determined by the
controlling device. When it is determined to be ON, then
the controlling device can energize the Remote Start-
Stop input. After the compressor has started, then the
compressor capacity is controlled by the selected op-
tion. Thought should also be given as to how the com-
pressor will be restarted after a power failure occurs.
Remote Monitoring
It should be noted that while the compressor is being
controlled (starting, stopping and load control) via hard-
wired inputs, the monitoring of compressor operating
parameters can still occur by using the communication
ports available in the MicroVission. Remote monitor-
ing can be accomplished by utilizing either the Ethernet
communication port (via Ethernet IP or Modbus TCP/
IP) or the serial port (via RS485 Modbus RTU). For com-
munication register information, refer to Appendix B:
Communication Table.
MicroVission Controller • Operation and Service Manual • Emerson • 35391MV 1.3

Communication Port Setup

See Figure C-1. Configuration Screen (Page 3).
For Serial Port Modbus RTU Monitoring
• Check the "Serial" box inside the "Communications"
section.
• Configure serial port settings (baud rate, # data bits,
# stop bits, parity) and panel ID number (which is
"node" number for Modbus RTU).
For Ethernet Monitoring
• Check the "Ethernet"
"Communications" section.
• Configure IP address and Subnet Mask.
• Select Protocol (Ethernet IP or Modbus TCP/ IP)
Once the port is setup properly, communication can be
established. You will be able to read from and write to
registers. In Direct I/O mode, you cannot write to reg-
isters in the Control Block region of Modbus registers
40170 through 40182.
box inside the
C - 9