Panasonic KT8, KT9 User guide

COMMUNICATION INSTRUCTIONMANUALTEMPERATURECONTROLLER KT4,KT8 and KT9

No.KTC1E6 2009.05 To prevent accidents arising fromthe misuse ofthis controller, pleaseensure the operator receives thismanual. For this product to which communication function has been added, “1” is entered after the heater burnout alarm indication in the model number. (For the model numberand basic operation, referto the instruction manual for KT4, KT8 and KT9.)

Warning

Turn the power supply to the instrument off before wiring or checking it. Working or touching the terminal with the power switched on may result in severe injury or

death due to Electric Shock.

1. Setup of the KT4, KT8 and KT9

Set the items “Communication protocol selection”, “Instrument number setting”, “Communication speed selection” “Parity selection” and “Stop bit selection” after the “Sensor correction setting” in the Auxiliary function setting mode 1. To enter Auxiliary function setting mode 1, press the key for 3 seconds while holding down the

key.

Character

(PV display)

Name, Functions and Setting range

Communication protocol selection ModbusASCII

• Selects the Communication protocol.

• Modbus ASCII mode: Modbus RTU mode: : Not available.

Instrument number setting 0

• Sets individual instrument number for each unit when communicating by

connecting plural controllers in serial communication. Up to 31 units can be connected, however, the instrument number can be set

within the range 0 to 95.

• 0 to 95

Communication speed selection 9600bps

• Selects a communication speed to correspond to that of host computer.

• 2400bps: , 4800bps: , 9600bps: , 19200bps:

Parity selection Even

• Selects the parity.

• No parity: , Even parity: , Odd parity:

Stop bit selection 1

• Selects the stop bit.

• 1 or 2

Default

(SV display)

2. Terminal arrangement

2.1 Terminal arrangement of KT4

(Fig. 2.1-1)

OUT1 : Control output 1 (Heating output) OUT2 : Control output 2 (Cooling output) RELAY: Relay contact output V/A : DC voltage output /DC current

output S : Non-contact relay output A1 : Alarm 1 output EVT : Event output (ComprisesA2

output and Heater burnout

alarm output) CT : Current transformer input TC : Thermocouple RTD : Resistance Temperature Detector DC : DC current or DC voltage

RS-485: Serial communication

2.2 Terminal arrangement of KT8 and KT9

OUT1 : Control output 1 (Heating output) OUT2 : Control output 2 (Cooling output) RELAY: Relay contact output V/A : Non-contact voltage output /DC

current output A1 : Alarm 1 output A2 : Alarm 2 output HB : Heater burnout alarm output SV2 : 2nd main setting CT : Current transformer input TC : Thermocouple RTD : Resistance Temperature Detector DC : DC current or DC voltage RS-485: Serial communication

(Fig 2.2-1)

3. System configuration

RS-485 multi-drop connection communication

Host computer

RS-485

Host computer

RS-232C

No.0 No.1 No.2

Communication

converter

232C 485

(Fig. 3-1)

No.0

(Fig. 3-2)

RS-485

KT KT

No.1

No.30

PLC

RS-485

No.0 No.1 No.2

(Fig. 3-3)

No.30

4. Wiring

Shielded

When using communication converter (RS-232C)

• Connector: D-sub 25-pin Connection: RS-232C RS-485 (Communication speed: 2400, 4800, 9600, 19200bps)

Host computer

wire

D-sub 25-pin connector

(Fig. 4-1)

• Connector: D-sub 9-pin Connection: RS-232C RS-485 (Communication speed: 2400, 4800, 9600, 19200bps)

Host computer

wire

KT4

KT8, KT9

wire

D-sub 9-pin connector

When connecting with PLC (RS-485)

Connection: RS-485 RS-485 (Communication speed: 2400, 4800, 9600, 19200bps)

wire

(Fig. 4-2)

KT4 KT8, KT9

(Fig. 4-3)

Shielded wire

Connect only one side of the shielded wire to the FG or GND terminal so that current cannot flow to the shielded wire. (If both sides of the shielded wire are connected to the FG or GND terminal, the circuit will be closed between the shielded wire and the ground. As a result, current will run through the shielded wire and this may cause noise.) Be sure to ground FG and GND terminals.

Terminator (Terminal resistor)

Do not connect terminator with the communication line because each KT4, KT8 and KT9 has built-in pull-up and pull-down resistors instead of a terminator. If there is a large distance between the PLC and the KT4, KT8 and KT9, connect the terminator (120 or more resistance) on the PLC side.

Setup of the KT4, KT8, KT9

• It is necessary to set the instrument number individually to the KT4, KT8 and KT9 when

communicating by connecting plural units with serial communication. Select a communication speed of KT4, KT8 and KT9 in accordance with that of the host computer.

• For instrument number setting and communication speed selection, refer to the instruction manual

for KT4, KT8 and KT9.

Memory life of the KT4, KT8, KT9

The memory can contain up to 1,000,000 (one million) set value entries. This memory life is sufficient when the set value is changed by keypad operation. However, when changing the set value frequently via the communication function, be careful not to exceed the 1,000,000 (one million) times limit. When Lock 1 or Lock 2 is used, every time the set value is changed by the communication function, the changed value is written in the non-volatile memory. If the value changed by the communication function is the same as previous one, it is not written in the non-volatile memory. When Lock 3 is used and if the set value is changed, the changed value is not written in the non-volatile memory until the power to the controller is turned off. This has no relation to the limit for changes in set value.

Therefore, be sure to use Lock 3 when changing the set value frequently via communication.

SV2 of the KT8, KT9

If communication function is applied to KT8 and KT9, SV2 cannot be set by the command.

5. Communication procedure

Communication starts with command transmission from the host computer (hereafter Master) and ends with the response of the KT4, KT8, KT9 (hereafter Slave).

Master Slave

Command

Data

Command

Acknowledgement

Command

Negative

acknowledgement

Command

No response

(Fig.5-1)

• Response with data

When the master sends the reading command, the slave

responds with the corresponding set value or current action status.

• Acknowledgement

When the master sends setting command, the slave

responds by sending an acknowledgement after the processing is terminated.

• Negative acknowledgement

When the master sends non-existent command or value

out of the setting range, the slave returns a negative acknowledgement.

• No response

The slave will not respond to the master when broadcast

address is set, or when there is a communication error (framing error or parity error), or when LRC or CRC discrepancy is detected.

Communication timing of the RS-485

Slave side

When a slave starts transmission through the RS-485 communication line, the slave is arranged so as to provide an idle status (mark status) transmission period of 1 or more characters before sending the response to ensure the synchronization on the receiving side. The slave is arranged so as to disconnect the transmitter from the communication line within a 1 character transmission period after sending the response.

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