Fuji Electric PXG9 Use and care manual

– 1 –
Introduction
Thank you for purchasing the Fuji Digital Temperature Controller.
This document describes how to connect the Micro controller PXG 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.

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Contents
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
Station No. ....................................................................... 21
Function Code.................................................................. 21
Data Part.......................................................................... 21
Error Check Code ............................................................ 21
Slave Response ............................................................... 22
Function Code.................................................................. 23
Calculating Error Check Code (CRC-16)............................. 24
Transmission Control Steps................................................. 25
Master Communication Method ....................................... 25
Explanation ...................................................................... 25
6.
Command and Transmission Frame Details
Reading Data ...................................................................... 28
Reading Read-Only Bit Data (Function Code: 02H) ........ 28
Reading Word Data (Function Code: 03H) ...................... 30
Reading Read-Only Word Data (Function Code: 04H) .... 32
Writing Data......................................................................... 34
Writing Word Data (1 word, function code: 06H) .............. 34
Writing Continuous Word Data (Function code: 10H) ...... 36
7. Address Map and Data Format
Data Format......................................................................... 40
Sent Data Format............................................................. 40
Internal Calculation Value and Engineering Unit .............. 40
Managing the Decimal Point ............................................40
Data during Input Error..................................................... 41
Written Data ..................................................................... 41
Addresses Not Written ..................................................... 41
Internal Calculation Value Data Address Map ..................... 42
Bit Data (read only): function code [02 (H)] ......................42
Word Data (read/write): function code
[03 (H), 06 (H), 10 (H)] ..................................................... 43
Word Data (read only): function code [04 (H)].................. 63
Engineering Unit Data Address Map ................................... 66
Bit Data (read only): function code [02 (H)] ......................66
8. Sample Program
Sample Program.................................................................. 68
9. Troubleshooting
Troubleshooting ................................................................... 78

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1
Chapter
Chapter 1
Communication Functions
Overview – 4

– 4 –
1
Chapter
Overview
•
The micro controller is equipped with communication functions from 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 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.
•
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 RS-232C communication with the personal computer by connecting the
PC loader interface on the bottom of this unit with the PC loader communication cable (RS-232C, model:
ZZPPXH1
*
TK4H4563) sold separately.
[RS-232C to RS-485 converter] (Recommended)
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.
Model number/Type Contact URL
KS3C-10 (insulating type) Made by Omron Corporation http://www.omron.co.jp
RC-77 (insulating type) Made by RA Systems Corporation http://www.ras.co.jp

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1
Chapter
Connecting to a programmable controller
Connecting to a personal computer
Caution
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-232C
to RS-485 converter. Communication will not work properly if the settings are incorrect.
Programmable
controller
RS-485
PXG Series
Personal
computer
RS-232C
PC loader communication cable
RS-232C to RS-485 converter
RS-232C
RS-485
PXG Series

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MEMO
1
Chapter

– 7 –
2
Chapter
Chapter 2
Specifications
Communication Specifications – 8

– 8 –
2
Chapter
Communication Specifications
RS-485
PC Loader Interface
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
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)
Item Specifications
Electrical specifications EIA RS232 C
Communication method 3wire system, half double-bit serial
Synchronous method Asynchronous
Connection status 1:1
Communication speed 9600 bps
Data format Data length 8 bits
Stop bit 1 bit
Parity none
Transmission code HEX value (MODBUS RTU mode)
Error detection CRC-16
Insulation Non-insulated internal circuit

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3
Chapter
Chapter 3
Connection
Communication Terminal Configuration – 10
●
Wiring – 11

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3
Chapter
Warning
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
■RS-485 (rear terminal)
PXG4
PXG5, PXG9
Te r minal
Number Signal Name
7 RS-485 +
8 RS-485 -
Te r minal
Number Signal Name
1 RS-485 +
2 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
(Bottom, φ2.5, three prong miniature jack)
PXG4
PXG5
PXG9
PC Loader Interface
PC Loader Interface
PC Loader Interface

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3
Chapter
Wiring
■ 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.
•
Te r minate both ends of the circuit with a terminating resistance of 100 Ω (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.
Master
SG
Slave
+
–
+
–
Shielded twist pair cable
Te r minating resistance
100W (1/2W)
Te r minating resistance
100W (1/2W)
PXG Series
PXG Series
PXG Series
RS-485 interface
or
RS-485 side of
RS-232C to RS-485 converter
+
–
+
–

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3
Chapter
•
When using the micro controller in an area where the imposed noise level is expected to exceed 1000V, we recommend using
a noise filter on the master side as seen in the figure below.
[Noise filter] (recommended): ZRAC2203-11 (made by TDK Corporation)
•
If there are problems with EMC during communication, the noise level 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.)
Noise filter
Programmable controller
or
Personal computer
+ RS-232C to RS-485 converter
RS-485
PXG Series

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3
Chapter
■ PC Loader Interface
•
Use the PC loader communication cable (RS-232C) sold separately.
PXG4
PXG5
PXG9
PC loader communication cable (RS-232C)
Master side
RS-232C
D-Sub 9 pin PXG4 Bottom view
Personal
computer
etc.
ZZPPXH1*TK4H4563
Master side
RS-232C
D-Sub 9 pin PXG5 Bottom view
Personal
computer
etc.
PC loader communication cable (RS-232C)
ZZPPXH1*TK4H4563
Master side
RS-232C
D-Sub 9 pin PXG9 Bottom view
Personal
computer
etc.
PC loader communication cable (RS-232C)
ZZPPXH1*TK4H4563

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MEMO
3
Chapter

– 15 –
4
Chapter
Chapter 4
Setting Communication Parameters
List of Setting Parameters – 16
●
Parameter Setting Procedure – 17

– 16 –
4
Chapter
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 be 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).
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 (main unit side)
■Loader interface (main unit side)
The parameters do not need to be set. Set the loader software (master) with the following settings.
•Communication speed: 9600 bps
•Parity: none
List of Setting Parameters
Parameter
channel
Parameter
display symbol Parameter name Initial value Setting range Remarks
"CC
CCoo ooMM MM CC CChh hh99 99"
(CoM Ch9)
"SS
SSTT TTnn nnoo oo" (STno) Station No. 1 0 to 255 Unit does not respond to communication when 0
is set.
"CC
CCoo ooMM MM" (CoM) Parity settings 96od 96od (9600 bps/odd)
96Ev (9600 bps/even)
96no (9600 bps/none)
19od (19200 bps/odd)
19Ev (19200 bps/even)
19no (19200 bps/none)
This is the procedure to specify communications
speed and parity check.
Set the master and all of the slaves with the
same settings.
"SS
SSCC CCCC CC" (SCC) Communication
permissions
rW r (read only)
rW (read and writable)
– Data length 8 bits Fixed (cannot be changed) Set the master and all of the slaves with the
same settings.
– Stop bit 1 bit Fixed (cannot be changed)

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4
Chapter
Parameter Setting Procedure
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.
(Note) If your micro controller does not have a communication function, "CC
CCoo ooMM MM CC CChh hh 99 99" will not be displayed. Please check with your
model.
1Press and hold the key to display "MM
MMvv vv11 11".
The MV1 of the monitoring screen is displayed.
2Press and hold the key to display the setup mode operation
menu
("oo
ooPP PPEE EE CC CChh hh 11 11"), then use the keys to display "CC CCoo ooMM MM CC CChh hh 99 99".
The communication menu is displayed.
3Press and hold the key, the use the keys to display
"SS
SSTT TTnn nnoo oo."
The station number is displayed.
4Press the key, then use the keys to set station
number to "3" when the bottom part of the display begins to blink.
This sets the parameter to "3".
5Press the key to confirm the setting.
6Use the keys to select the parity setting ("CC
CCoo ooMM MM").
7Press the key, then use the keys to set the parity
setting to "96no" when the bottom part of the display begins to
blink.
The parity setting is set to "9600 bps/none".
8Press the key to confirm the setting.
9Use the keys to select the communication permissions
("SS
SSCC CCCC CC").
10 Press the key, then use the keys to set the protocol to
"rW" when the bottom part of the display begins to blink.
"read/write" is selected.
11 Press the key to confirm the setting.

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4
Chapter
12 Press the key to return to the operation mode PV/SV display.
13 Turn the power to the micro controller off and on again.
The changes to the communication parameters become effective after
the power turns off and on again.