Momentum Modbus Plus 170 PNT Series Guide de l'utilisateur télécharger pdf (Page 144)

Using the Modbus Plus Ports

132

870 USE 101 00 V.2.2

Modbus Plus Addresses

Introduction

Modbus Plus devices function as peers on a logical ring. Each device accesses the

network by acquiring a token frame that is passed in a rotating address sequence.

Each device on a Modbus Plus network needs a unique address in the range

1...64. The device address determines the logical order in which the network token

will be passed from device to device.

Address

Sequence

The assignment of addresses does not have to map to the physical layout of the

network–e.g., device 17 is placed physically before device 3. This is important to

understand because the network's token rotation is defined by device addresses-

e.g., device 2 will pass the token to device 3, device 3 to device 4, etc.

Illegal Addresses

If you set the node address to 00 or to a value greater than 64:

The COM LED will go ON steadily to indicate an illegal address assignment.

The Run LED will flash 4 times.

The Processor Adapter will not run until you set a valid, unused address on the

Option Adapter and cycle power.

Continued on next page

CAUTION

COMMUNICATION ERRORS MAY RESULT

Do not install a Modbus Plus Option Adapter before you have set its Modbus Plus address

for your application. See your network administrator to get the Modbus Plus node address

for this module.

Failure to observe this precaution can result in injury or equipment damage.

1 2 ... 139 140 141 142 143 144 145 146 147 148 149 ... 372 373

Pas de commentaire

Momentum Modbus Plus 170 PNT Series Guide de l'utilisateur Page 144