Onicon F-2600 Uživatelský manuál stáhnout pdf (Strana 81)

11451 Belcher Road South, Largo, FL 33773 • USA • Tel +1 (727) 447-6140 • Fax (727) 442-5699 • [email protected]

F-2600 & F-2700 Vortex Flow Meter Manual 02/15 - 0808-7 / 19204 Page 81

4.2 MODBUS COMMUNICATIONS

Applicable Flow Meter Models: ONICON F-2600 & F-2700 Series Mass Flow Meters with Modbus

communication protocol and rmware version 4.00.58 and above.

Overview

This document describes the preliminary implementation of the Modbus communication protocol

for use in monitoring common process variables in the ONICON F2600 Series Mass Vortex Flow

Meter. The physical layer utilizes the half-duplex RS-485 port and the Modbus protocol.

Reference Documents

The following documents are available online from www.modbus.org.

Modbus Application Protocol Specication V1.1

Modbus Over Serial Line Specication & Implementation Guide V1.0

Modicon Modbus Protocol Reference Guide PI–MBUS–300 Rev. J

4.2.1 Wiring

An RS-485 daisy chained network conguration as depicted below is recommended. Do

not use a star, ring, or cluster arrangement.

RS-485 -

RS-

485 +

RS-485 GND

RS-485 Master

Vortex Meter

RS-485 -

RS-485 +

RS-485 GND

RS-485 -

-485 +

-485 GND

Other Device 2, etc.

RS-485 -

RS-485 +

RS-485 GND

Other Device 1

Figure 53. RS-485 Wiring (MODBUS)

PIN LABELING (AMONG DEVICES)

“RS-485 –” = “A” = “TxD-/RxD-” = “Inverting pin”

“RS-485 +” = “B” = “TxD+/RxD+” = “Non-Inverting pin”

“RS-485 GND” = “GND” = “G” = “SC” = “Reference”

WARNING

Place controls in manual mode when making conguration changes to the vortex meter.

1 2 ... 76 77 78 79 80 81 82 83 84 85 86 ... 130 131

Žádné komentáře

Onicon F-2600 Uživatelský manuál Strana 81