Black Box IC108A Uživatelská příručka stáhnout pdf (Strana 32)

Advant

Smart Device (HART

) Interface User’s Guide

Chapter 2 Installation

2-20 3BUR 001 085R0001 REV A

connection to the SHIM RS-232 serial port is made using screw terminations XTB1-3, XTB1-4,

and XTB1-7, see Figure 2-3.

NOTE

Contacts XTB1-5 and XTB1-6 of the SHIM RS-232 serial port support

connection of a modem to the SHIM, and are jumpered together.

The 3BUC900041R0001 MVI to RS-232/485 Converter Interface Cable connects an MVI RS-

232 port to the RS-232/485 converter. Cabling from the converter’s RS-485 port to the RS-485

port of the first SHIM on the RS-485 Bus is not supplied by ABB. You can then daisy chain up

to 31 SHIM RS-485 serial ports on a RS-485 Bus.

The SHIM to SHIM RS-485 serial port interconnections on the RS-485 Bus are shown in

Table 2-12.

NOTE

The SHIM RS-485 serial port contacts allow you to replace a SHIM without

disrupting the RS-485 Bus.

2.3.1.3 Setting SHIM ModbusB Slave Address

Each SHIM connected on the RS-485 Bus must have a different ModbusB slave address. The

SHIM ModbusB slave address is set on a 8-position DIP switch labeled S1 which is accessible

from the back panel of the SHIM’s 6U cassette housing as shown in Figure 2-16.

The first switch position (S1-1) has a binary weight of 1 when ON (towards the number on the

DIP switch). The second through eighth switch positions (S1-2 through S1-8) have respective

binary weights of 2, 4, 8, 16, 32, 64, and 128 when ON. If a switch position is OFF (away from

the number on the DIP switch), it has a binary weight of 0. Only SHIM ModbusB slave

addresses 1 through 31 are supported, therefore, only positions S1-1 through S1-5 are used to

set SHIM ModbusB slave addresses and positions S1-6 through S1-8 are always set to OFF.

Table 2-12. SHIM to SHIM RS-485 Interconnections on RS-485 Bus

SHIM RS-485 Serial Port SHIM RS-485 Serial Port

Contact Signal Contact Signal

XTB1-8 DATA + XTB1-8 DATA +

XTB1-9 DATA - XTB1-9 DATA -

NC Shield NC Shield

1 2 ... 27 28 29 30 31 32 33 34 35 36 37 ... 117 118

Žádné komentáře

Black Box IC108A Uživatelská příručka Strana 32