Caple C806C Manuál s instrukcemi stáhnout pdf (Strana 16)

PF2100

Modbus Card Instruction Manual v1.1

Jan 5, 2012

Page 12

Electrical Wiring

The following steps should be followed to wire up the pluggable header on the Modbus Card. More detailed instructions for

each step can be found later in this section of the document.

1. Disconnect power from the PF2100 to prevent accidentally shorting any component of the system.

2. Remove the pluggable header from the Modbus Card.

3. Wire up the communication pins to the RS-485 Bus.

4. Wire up the “GND” pin to the RS-485 Bus.

5. Replace the pluggable header back onto the Modbus Card and ensure that it is fully inserted.

6. Reconnect power to the PF2100.

The Pluggable Header

The terminal block on the Modbus Card includes a pluggable header. You may find it easier to wire up if you first remove the

pluggable header from the Modbus Card by pulling it out as shown in Figure 11.

The pluggable header has set screws to loosen or tighten the wire cages on the front of the connector. Turn the screw

clockwise to raise and thus tighten the cage. Turn the screw counter clockwise to lower and thus loosen the cage.

Wires should not be stripped longer than 9mm to prevent bare conductor from being exposed after insertion into the terminal block.

Insert each wire fully into the front of the pluggable header and then ensure that the corresponding set screws are tight enough to securely clamp the wires in

place.

Connecting the Communication Wires

The wiring will be a bit different depending on the version of card that you have:

• For Modbus Card v1.0, wire up the A, B, Y, and Z communication terminals to the RS-485 Bus according to Figure 13. The jumper wires from A-to-Y and

from B-to-Z are required for half-duplex operation. Full-duplex communication may be possible but is not officially supported by this card or by the RS-

485 standard.

• For Modbus Card v2.0, wire up the + and - communication terminals to the RS-485 Bus according to Figure 12. Only half-duplex operation is supported.

If your device is not at the end of the bus, you will need to use shunt wires to “drop” your device onto the bus. Make sure to keep the wires used for the “drops”

as short as possible.

Figure

1 2 ... 11 12 13 14 15 16 17 18 19 20 21 ... 25 26

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