Fuji Electric PXF Operating Manual

MODEL : PXF

INP-TN5A2227a-E

Introduction

Thank you for purchasing the Fuji Digital Temperature Controller. This document describes how to connect the Micro controller PXF Series (referred to below as "Micro controller") to the personal computer or programmable controller. It also describes communication specifications for controlling and monitoring the communications with the micro controller, MODBUS protocol, and address map for the micro controller. In addition to this document, please make sure to read the Instruction Manual (which comes with the product) and the Operations Manual (packaged separately).

NOTE

■ Exclusions

The contents of this document may change without prior notice. Although great care has been taken in the accuracy of this document, Fuji Electric takes no responsibility for loss or indirect damages caused by mistakes, missing information, or use of information in this document.

– 1 –

1. Communication Functions

Overview................................................................................4

Connecting to a programmable controller.......................... 5

Connecting to a personal computer...................................5

2. Specifications

Communication Specifications..............................................8

RS-485...............................................................................8

PC Loader Interface...........................................................8

3. Connection

Communication Terminal Configuration...............................10

Wiring..................................................................................11

4. Setting Communication Parameters

List of Setting Parameters ...................................................16

Parameter Setting Procedure..............................................17

5. MODBUS Communication Protocol

Overview..............................................................................20

Message Composition.........................................................21

Calculating Error Check Code (CRC-16).............................24

Transmission Control Steps.................................................25

Prercautions when Writing Data..........................................26

7. Address Map and Data Format

Data Format.........................................................................38

Internal Calculation Value Data Address Map.....................40

8. Sample Program

Sample Program..................................................................68

9. Cooperative operation

Overview..............................................................................70

Connection...........................................................................71

Setup and related parameters .............................................72

Cooperative operation..........................................................73

List of parameters subject to the cooperative operation......74

10. Programless communication

Overview..............................................................................82

Connection...........................................................................83

Programless communication................................................84

Setup and related parameters .............................................88

Setup for Programless Communication ...............................90

11. Troubleshooting

Troubleshooting..................................................................126

Command and Transmission Frame Details

Reading Data ......................................................................28

Writing Data.........................................................................32

– 2 –

Chapter 1

Communication Functions

Overview – 4

– 3 –

Overview

Caution

• The micro controller is equipped with communication functions fr om the RS-485 interface and PC loader interface, which

enables the transmission and reception of data between such devices as the personal computer, programmable controller, and graphic panel.

• The version with RS-485 communication can provide the following three function s.

1. MODBUS RTU communication Typical master/stave communication is available. A PC or PLC acts as a master, while multiple temperature controllers act as slaves. Communication is made in such a way that the master sends messages to the slaves, and the slaves respond to it.

2. Cooperative operation When you control one temperature controller, the other controllers follow it. The one controller

3. Programless communication Programmable controller (PLC) can read the data of temperature controllers or write data on

The following is the description for MODBUS RTU communication. For cooperative operation and programless communication, refer to Chapter 9 "Cooperative operation" and/or Chapter 10 "Programless communication".

• The communication system is composed of a master and slave relationship. Up to thirty-one slaves (micro controllers) may

be connected to one master (such as a personal computer) based on a “single master/multiple slave” method.

• However, the master can only communicate with one slave at a time. Therefore, each slave is specified by the "Station No."

setting.With PC loader communication, only one slave can be connected to one master.

Caution

• Systems constructed with the micro controller as slaves do not respond to messages issued by the master with broadcast queries where the station number is "0".

• PC loader communication is not compatible with the multiple slave method.

acts as a master, while other controllers act as slaves. When you change the settings of the master controller, a message will be sent to all slave controllers which follow the change.

temperature controllers without preparing a rudder program. One PLC acts as a master, and multiple temperature controllers act as slaves. Each temperature controller in turn carries out master-slave communication with PLC. The communication protocol is MODBUS RTU.

• In order to have proper communication between master and slave, the transmission data must be in the same format. This

document explains how to transmit data using the MODBUS protocol format.

• When using equipment with an RS-232C interface, such as a personal computer, as the master, make sure to use an RS-

232C to RS-485 converter.

• When using PC loader communication, you can use communication with the personal computer by connecting the PC loader

interface on the bottom of this unit with the PC loader communication cable (model: ZZP

TQ501923C3) sold separately.

RS-232C to RS-485 converter (recommended product)

Model Manufacturer URL Baud rate KS3C-10 (isolated type) OMRON Corporation http://www.omron.co.jp Maximum 38400 bps SI-30FA (isolated type) LINEEYE Co., Ltd. http://www.lineeye.co.jp Maximum 115.2 Kbps

– 4 –

Connecting to a programmable controller

Caution

Programmable controller

RS-485

PXF Series

Connecting to a personal computer

Personal computer

PC loader communication cable

RS-232C

RS-232C to RS-485 converter

RS-485

PXF Series

When using the RS-232C to RS-485 converter, check to make sure that the cable is properly connected between the converter and master. Communication will not work properly if the connection is incorrect. Also be sure to correctly set the communication settings (such as communication speed and parity) on the RS-2 32C to RS-485 converter. Communication will not work properly if the settings are incorrect.

– 5 –

MEMO

– 6 –

Chapter 2

Specifications

Communication Specifications – 8

– 7 –

Communication Specifications

RS-485

Item Specifications Electrical specifications EIA RS-485 compliant Communication method Two wire system, half double-bit serial Synchronous method Asynchronous Connection status 1:N Max. no. of connections 31 units Communication distance Max 500m (total length) Communication speed 9600bps, 19200 bps, 38.4kbps, 115.2kbps Data format Data length 8 bits

Stop bit 1 bit

Parity None/Even/Odd (Selectable) Transmission code HEX value (MODBUS RTU mode) Error detection CRC-16 Insulation Functional insulation for the transmission area and

other areas (withstanding AC 500V)

PC Loader Interface

Item Specifications Electrical specifications TTL Level Communication method 3wire system, half double-bit serial Synchronous method Asynchronous Connection status 1:1 Station No. 1 (Not to be changed) Communication speed 38.4kbps (Not to be changed) Data format Data length 8 bits

Stop bit 1 bit

Parity none (Not to be changed) Transmission code HEX value (MODBUS RTU mode) Error detection CRC-16 Insulation Non-insulated internal circuit

– 8 –

Chapter 3

Connection

Communication Terminal Configuration – 10

●

Wiring – 11

– 9 –

Warning

■ RS-485 (rear terminal) PXF4

PXF5, PXF9

Terminal

Number

Signal Name

7 RS-485 + 8 RS-485 -

Terminal

Number

Signal Name

25 RS-485 + 26 RS-485 -

1 2 3 4 5 6

7 8

9 10 11 12

13 14 15 16 17 18

1 2 3 4 5 6 7 8

9 10 11 12

25 26 27 28 29 30 31 32

33 34 35 36

■ PC Loader Interface PXF4

PXF5

PXF9

Do not turn on power until all of the wiring is completely finished. There is a risk of electrical shock or damage.

Communication Terminal Configuration

PC Loader Interface

– 10 –

Wiring

Master

Slave

+ –

Shielded twist pair cable

Terminating resistance 100W (1/2W)

PXF Series

RS-485 interface

RS-485 side of

RS-232C to RS-485 converter

+ –

–

■ RS-485

• Please use a shielded twist pair cable. (Recommended cable: KPEV-SB (made by The Furukawa Electric Co., Ltd.))

• The maximum cable length should be 500m. One master and up to thirty-one micro controllers (slaves) can be connected per

circuit.

• Terminate both ends of the circuit with a terminating resistance of 100Ω (1/2W or more).

• Ground the shielded cable once towards the master side.

• SG does not have to be connected, but it can be used as an effective countermeasure against communication errors due to

noise.

– 11 –

• When using the micro controller in an area where the imp ose d noise level is expected to exceed 1000V, we recommend using

Noise filter

Programmable controller

Personal computer

+ RS-232C to RS-485 converter

RS-485

PXF Series

a noise filter on the master side as seen in the figure b el ow. [Noise filter] (recommended): ZRAC220 3-1 1 (ma de by TDK Corporation)

• If there are problems with EMC during communication, the noise l evel can be reduced by using a communication cable with a

ferrite core. Ferrite core (recommended): ZCAT series (made by TDK Corporation)

MSFC series (made by Morimiya Electric Co., Ltd.)

– 12 –

■ PC Loader Interface

PC loader communication cable

Master side

USB

PXF4 Left view

Personal computer etc.

ZZP

TQ501923C3

Master side

PXF5 Left view

Personal computer etc.

PC loader communication cable

ZZP

TQ501923C3

USB

• Use the PC loader communication cable sold separately.

PXF4

PXF5

PXF9

Master side

Personal computer etc.

USB

PC loader communication cable

TQ501923C3

ZZP

PXF9 Left view

– 13 –

MEMO

– 14 –

Chapter 4

Setting Communication Parameters

List of Setting Parameters – 16

●

Parameter Setting Procedure – 17

– 15 –

The following settings are required for proper communication between the master and micro controller units.

• The communication parameters for the master and all of the units must be set the same.

• During RS-485 communication, all of the micro controllers on a circuit must b e set with different "Station No. (STno)" other

than "0 (zero)". (Multiple micro controllers must not have the same "Station No.".)

• When using the PC loader interface, settings are not necessary on the main unit (the micro controller).

List of Setting Parameters

The setting parameters are shown in the chart shown below. Change the settings using the keys on the front of the micro controller.

■ RS-485 (controller side)

Parameter

channel

CoM CH9

Screen

Parameter

No.

760

761

762

763

764

767

display symbol

CTYP Communication

StNo Station No. 0 to 255 (0: unresponsive

SPEd RS-485 baud rate 96: 9600 bps

PRty RS-485 parity none

iNtV RS-485 response

SCC Communication

–

– Data length Fixed (cannot be changed) 8 bits Set the master and all of the slaves with

– Stop bit Fixed (cannot be changed) 1 bits Set the master and all of the slaves with

Name Setting range

0: MODBUS RTU

type

interval

permissions

1: Cooperative operation 2: Programless communication

communication)

192: 19200 bps 384: 38400 bps 115K: 115 Kbps

odd even

0 to 100 1 Widen the time interval of receiving

r: read only rW: read/writable

Initial value

0 Select "0: MODBUS RTU".

1 Sets the station number.

96 Sets the baud rate

odd Sets the parity check

response. (Set value x 20 ms)

rW Sets whether or not overwriting is

possible from the master side (PC, etc.)

the same settings.

Remarks

■ Loader interface (main unit side)

The parameters do not need to be set. Set the loader software (master) with the following settings.

• Communication speed: 38400 bps

• Parity: none

– 16 –

Parameter Setting Procedure

Pid

CoM

"3"

"96"

odd

"NoNE"

"WR"

The following steps explain how to change the settings to station number "3", parity setting "9600bps/none", and communication permissions "read and writable" as an example.

Press and hold the key to move to "channel selection mode".

Use the keys to select "CoM CH9".

Press the key to display "StNo".

Press the key, and whe n the bottom part of the display begins to blink, use the keys to select "3".

The station number "3" is selected.

Press the key to set.

Use the keys to select "SPEd".

Press the key, and whe n the bottom part of the display begins to blink, use the keys to select "96".

The RS-485 baud rate is set to "9600 bps".

CH 1

CH 9

StNo

SPEd

Press the key to set.

Use the keys to select "PRty".

Press the key, and whe n the bottom part of the display begins to blink, use the keys to select "NoNE".

The RS-485 parity is set to "none".

Press the key to set.

Use the keys keys to select SCC ("SCC").

Press the key, and whe n the bottom part of the display begins to blink, use the keys to select "WR".

Communication permissions is set to "read/writable".

PRty

SCC

– 17 –

Press the key to set.

Press the key to return to the operation mode PV/SV screen.

Turn the power to the micro controller off and on a g ain.

The changes to the communication parameters become effective after the power turns off and on again.

– 18 –

Chapter 5

MODBUS Communication Protocol

Overview – 20

●

Message Composition – 21

●

Calculating Error Check Code (CRC-16) – 24

●

Transmission Control Steps – 25

●

Prercautions when Writing Data – 26

– 19 –

Overview

Master Slave

Command Message

Response Message

Station number is the same

The communication system with the MODBUS protocol always operates using a method where the master first sends a command message and the applicable slav e re plys with a respo nse message . The following describes the communication steps.

Master sends the command message for the slave.

The slave checks whether the station number in the received message is the same as its own station number.

When it’s the same When it’s not the same

The slave runs the command and sends a response message.

The slave throws out the received message and waits for the next command message. (No reply.)

● When the station number in the command message is the same as the unit’s station number

● When the station number in the command message is not the same as the unit’s station number

Master Slave

The master can communicate with an individual slave when multiple slaves are connected on the same circuit by the station number specified in the master’s command message.

Command Message

Station number is not the same

– 20 –

Message Composition

Refer to

The command message and response message are composed of four parts: the station number, function code, data part, and error check code. These four parts are sent in that order.

Field name No. of bytes Station No. 1 byte Function Code 1 byte Data Part 2 to 125 bytes Error Check Code (CRC-16) 2 bytes

The following describes each part of the message.

Station No.

This is the number specifying the slave. Commands can only be processed by slaves that have the same value set in the "STno" parameter.

For more about setting the "STno" parameter, see "Chapter 4, Setting Communication Parameters" (p. 15).

Function Code

This code specifies the function for the slave to perform.

For more about function codes, see "Function Code" (p. 23).

Data Part

This data is required to run the function code. The composition of the data part is different depending on the function code.

See "Chapter 6, Command and Transmission Frame Details" (p. 27).

The data in the micro controller is assigned a coil number or resistor number. This coil number or resistor number is specified when the data is read or written through communication. The coil number or resistor number used by the message employs a relative address. The relative address is calculated using the following formula.

Relative address = (last four digits of the coil number or resistor number) – 1

(Ex.) When a function code specifies resistor number "40003"

Relative address = (the last four digits of 40003) – 1

= 0002

is used in the message.

Error Check Code

This code detects whether there are errors (changes in the bits) dur ing the signal transmission processes. MODBUS protocol (RTU mode) uses CRC-16 (Cyclic Redundancy Check).

For more about calculating CRC, see Section 5, "Calculating Error Check Code (CRC-16)" (p. 24).

– 21 –

Slave Response

Refer to

■ Normal Slave Response The slave creates and replies with a response message for each command message. The response message has the same format as the command message. The contents of the data part are different depending on the function code.

See "Chapter 6, Command and Transmission Frame Details".

■ Irregular Slave Response If there are problems (such as specification of a nonexistent function code) with the contents of the command message other than transmission error, the slave creates and replies with an error response message without following the command. The composition of the error response message uses the value of the function code in the command message plus 80 below.

Field name No. of bytes Station No. 1 byte Function Code +80

H 1 byte

Error Code 1 byte Error Check Code (CRC-16) 2 bytes

The error code is shown as follows.

Error Code Contents Explanation

H Faulty function code A nonexistent function code was specified. Please check the function code.

H Faulty address for coil or resistor The specified relative address for the coil number or resistor number cannot be

used by the specified function code.

H Faulty coil or resistor number The specified number is too large and specifies a range that does not contain

H Write inhibited Data writing via communication is prohibited. “SCC” parameter is set to “R: read

H Busy EEPROM is busy in writing. Wait for a few seconds, and then retry writing.

coil numbers or resistor numbers.

only”.

H, as seen

■ No Response In the following situations, the slave will ignore the command message and not send a response message.

• The station number specified by the command message is not the same as the slave’s specified station number.

• The error check code does not correspond, or a transmission error (such as parity error) is detected.

• The interval between the data comprising the message is empty for more than 24 bit time.

See Section 5 "Transmission Control Steps" (p. 25).

• The slave station number is set to "0".

– 22 –

Function Code

For MODBUS protocol, coil numbers or resistor numbers are assigned by the function code, and each function code only works for the assigned coil number or resistor number. The correspondence between the function code and the coil number or resistor number is as follows.

Function Code Coil Number, Resistor Number

Code Function Target Number Contents

H Read (continuous) Hold resistor 3xxxx Read word data

03 04

H Read (continuous) Input resistor H Write Hold resistor

H Write (continuous) Retention resistor

The message length for each function is as follows.

Code Contents

H Read word data 60 words

H Read word data (read-only) 60 words

04 06

H Write word data 1 word 8888 H Continuously write word data 60 words

Assignable

Data Number

*1 *1

Command Message Response Message

Minimum Maximum Minimum Maximum

4xxxx Read/write word data

[unit: byte]

887125 887125

11 129 8 8

*1: "Assignable Data Number" above is limited by the data number that the micro controller assigned to the coil number or

address number. (Excluding function code 06

H).

– 23 –

Calculating Error Check Code (CRC-16)

YES

* Description of Variables

CR : CRC error check data (2 byte) J : Command message calculation

character digit

K : No. of times to check CR calculation

Start

Set J = 1

Set K = 1

Add 1 to K

Complete

Add 1 to J

Set CR to FFFF

H (hexadecimal)

Exclusive-or (XOR) runs on each character of J (one byte) for CR and the specified message, and sets that result to CR.

After CR has been adjusted one bit to the right, A001

H and XOR

run and set that result to CR.

Is the right-hand

bit for CR 1?

Adjust CR one bit to the right.

Has calculation

finished 8 times ?

J > 8

Has every character

been calculated ?

J > Number of characters

(Calculations occur in the order command message station number, function code, and data.)

The CR calculation result is added onto the end of the command message in LOW or HIGH order.

CRC-16 is a 2-byte (16-bit) error check code. The calculation range extends from the start of the message (station number) to the end of the data part. The slave calculates the CRC of the received message and ignores the message if this value is not the same as the received CRC code. CRC-16 is calculated as follows.

– 24 –

Transmission Control Steps

Caution

Master Communication Method

Start communication from the master while following the rules below.

1. The command message, must be sent after an empty space of at least 48 bit time.

2. The interval between each byte in a command message should be less than 24 bit time.

3. After sending a command message, for less than 24 bit time the master will enter receiving standby.

4. After receiving the response message, the next command message must be sent after at least 48 bit time. (Similar to #1.)

5. For safety reasons, create a framework where the master checks the response message, and if there is no response or an error occurs, retry at least three times.

The definitions written above are for the minimum required value. For safety reasons, we recommend creating a master side program that keeps margins two to three times as large. For a concrete example, with 9600 bps, we recommend programming a blank state (#1 above) of at least 10ms, and the interval between bytes (#2 above) and switching time from sending to receiving (#3 above) within 1 ms.

Explanation

■ Frame Detection

This communication system uses a two-wire RS-485 interface, and the circuit can therefore enter one of the following two states.

• Empty state (no data on the circuit)

• Communication state (data running on the circuit)

The units connected on the circuit start in receiving state and monitor the circuit. When a blank state appears on the circuit f or at least 24 bit time, the unit detects the end of the previous frame, and within the next 24 bit time, enters receiving standby. When data appears on the circuit, the unit begins receiving data, and once another blank state of at least 24 bit time is detected, that frame is ended. In other words, the data on the circuit from the first time that a 24 bit time blank state appears to the second time one appears is loaded as one frame (a bundle of data). Therefore, one frame (command message) must be sent while following the rules below.

• Before sending the command message, leave an empty space of at least 48 bit time.

• The interval between each byte in a command message should be less than 24 bit time.

■ Micro controller Response

After the micro controller detects the frame (detects blank states at least 24 bit time long), that frame is used to send a command message. When a command message is sent locally, the response message is returned, but the processing time is about 1 to 30 ms. (The time may change depending on the contents of the command message. ) Therefore, one frame (command message) must be sent while following the rules below.

– 25 –

• After sending a command message, for less than 24 seconds the master will enter receiving standby.

Caution

Master

POL1

POL1 response data

POL2 response data

Slave

POL2

1 to 30ms

Interval of at least 10ms required (at least 20ms recommended)

Prercautions when Writing Data

PXF contains internal nonvolatile memory (EEPROM) that is used to save the setting parameters. The data written to the nonvolatile memory (EEPROM) remains even after the power for PXF is turned off. Parameters that are written via communication are automatically saved in the internal nonvolatile memory (EEPROM). However, please note that there are two limitations as follows.

1. There is a limit to the number of times that data can be transferred to the nonvolatile memory (EEPROM) (100,000 times). Data cannot be guaranteed if written more than 100,000 times. Be careful not to transfer unnecessary data when writing data via communication. In particular, when constructing a communication system with master POD (such as a touch panel), make sure that the POD writing and trigger settings are appropriate. Avoid writing at fixed cycles.

2. Writing to the nonvolatile memory (EEPROM) takes seve ral milliseconds . If the pow er f or PXF is turned off during this operation, the data saved to the nonvolatile memory (EEPROM) may be corrupted. Wait several seconds after writing data before turning off the power. In particular, when writing data in a cycle from master device, there is a greater danger of the writing timing and power shutoff timing coinciding. Avoid writing at fixed cycles.

– 26 –

Chapter 6

Command and Transmission Frame

Details

Reading Data – 28

●

Writing Data – 32

– 27 –

Reading Data

Master Slave

Command Message Composition (bytes)

Station No. Function Code

No. to Start Reading (Relative Address)

Upper Lower

No. of Words to Read (1 to 60 words)

Upper Lower

CRC Data

Upper Lower

Reply Message Composition (bytes)

Station No. Function Code No. of Bytes to Read

(No. of Words to Read x 2) First Word Data

Contents

Upper Lower

Next W ord Da ta Contents

Upper Lower

Last Word D a t a Contents

Upper Lower

CRC Data

Upper Lower

■ Meaning of Read Word Data

MSB LSB

First Word Data upper byte First Word Data lower byte Next Word Data upper byte Next Word Data lower byte

Last Word Data upper byte Last Word Data lower byte

Reading Word Data (Function Code: 03H)

The unit reads word data continuously for the specified number of words from the first number to start reading from. The slave forwards the read word data from the upper number of bytes to the lower number.

Function Code 03H Max. No. of Words to Read in One Message 60 words Relative Address 0000H to 07CFH Resistor Number 40001 to 42000 42001 to 45032

Contents

Internal Calculation Value

Message Composition

H to 013AH

07D0

Engineering Unit

– 28 –

Example of Transmitting a Message (For Engineering Unit)

Refer to

Master Slave

Command Message (bytes)

Station No. 02H Function Code 03H

No. to Start Reading (Relative Address)

Upper 07H Lower E7H

No. of Words to Read

Upper 00H Lower 02H

CRC Data

Upper 78H Lower 95H

Response Message (bytes)

Station No. 02H Function Code 03H No. of Bytes to Read 04H

First Word Data Contents

Upper 00H Lower 00H

Next Word Data Contents

Upper 01H Lower 90H

CRC Data

Upper C8H Lower CFH

The message is composed as fo ll ows when reading the PV input lower limit and PV input upper limit from station number 2.

• PV Lower Limit Relative Address: 07E1H

■ Meaning of Read Data

PV Input Lower Limit 00 00H = 0 PV Input Upper Limit 01 90H = 400

If Decimal Point Position = 0, then the PV input upper limit and lower limit are as follows. PV Lower Limit = 0°C PV Upper Limit = 400°C

For more about the internal calculation value, engineering unit, and decimal point see "Chapter 7, Address Map and Data Format" (p. 39).

– 29 –

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