Calex PMB21 Panduan Operator - Halaman 6

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ELECTRICAL INSTALLATION

This diagram shows how to connect the sensors and output modules to a Modbus Master,

such as a Modbus PLC, SCADA system, Calex Panel PC or PM180 touch screen terminal.

Up to 247 slave devices, such as PyroMiniBus sensors and output modules, can be connected

to the same Modbus network.

SHIELDING

PyroMiniBus sensors use a shielded cable. The RS485 network bus cable and junction boxes

should also be shielded.

Avoid ground loops. Ensure there is only one path to ground from any point on the network

shielding.

Note: The sensing head metalwork forms part of the shield.

Ensure the PWR- wires of all sensors and GND of all output modules are connected to the

Signal Ground of the Modbus Master (or PWR- of the PM180 Modbus Master interface) and

the 0 V of the sensor power supply.

For more information on electrical connections to the PM180, including how to connect the

Modbus Slave interface, please see the PM180 section of this Operator's Guide.

IMPORTANT

Do not connect or disconnect Modbus devices with power on. Always disconnect power

before modifying electrical connections.

SENSOR WIRE COLOUR CODES:

WIRE COLOUR

Red

Black

White

Green

MODBUS OVER SERIAL LINE (RS485)

INTERFACE

Baud rate

Format

Reply delay

(ms)

9600

8 data, No parity, 1 stop

WIRE IDENTITY

PWR+

PWR-

RS+

RS-

SUPPORTED FUNCTIONS

Read register

Write single register

Write multiple register

0x03, 0x04

0x06

0x10