Lenze E94P PositionServo Modbus User Manual download pdf (Page 7)

7 P94MOD01C

Introduction

2 Introduction

The following information is provided to explain how the PositionServo drive operates on a Modbus network; it

is not intended to explain how Modbus itself works. Therefore, a working knowledge of Modbus is assumed,

as well as familiarity with the operation of the PositionServo drive.

2.1 Fieldbus Overview

Modbus is an internationally accepted asynchronous serial protocol designed for commercial and industrial

automation applications.

The Modbus RTU architecture is based upon a Master-Slave orientation in which the PositionServo drive is

always a slave node. While the Modbus RTU protocol does not specify the physical layer, the most commonly

used is 2-wire EIA-485 (RS485). The PositionServo requires the use of an EIA-485 option module (E94ZARS41)

to be able to connect to such a network and communicate via Modbus RTU.

Modbus TCP/IP uses an Ethernet physical layer and as such peer-to-peer and client-server communication

techniques are possible. However, the PositionServo drive is always a server (slave node).

2.2 EIA-485 Module

2.2.1 Speciﬁcation

• Supported baudrates: 115200bps, 57600bps, 38400bps,19200bps, 9600bps

• Parity modes supported: Even, Odd, None

• Stop bits supported: 2, 1.5, 1

• EIA-485, 2-wire (half duplex)

• Network impedance loading of 1 unit (EIA-485 speciﬁcation stipulates max of 32 units per network segment)

2.2.2 Module Identiﬁcation Label

Figure 1 illustrates the labels on the PositionServo EIA-485 (RS485) option module. The PositionServo EIA-485

module is identiﬁable by:

• One label afﬁxed to the side of the module.

• The TYPE identiﬁer in the center of the label: E94ZARS41

• The port (interface) identiﬁer, P21, on the right hand side of the label.

TYPE: E94ZARS41BT

ID-NO: 123456789

039080825

E94ZARS41BT000XX1A10

Made in USA

Communications

RS485 Module

P21

A: Fieldbus Protocol

B: Model Number

C: Lenze Order Numbe

D: Firmware Revision

E: Hardware Revision

Figure 1: PositionServo EIA-485 (RS485) Module Label

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Lenze E94P PositionServo Modbus User Manual Page 7