Shinko ACS-13A, ACS-13A C5 Communication Instruction Manual

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6. Modbus

protocol

6.1 Transmission mode

There are 2 transmission modes (ASCII and RTU) in Modbus protocol.

6.2 ASCII mode

Hexadecimal (0 to 9, At oF) , which is divided into high order (4-bit) and low order (4-bit) out of 8-bit binary data in command is transmitted as ASCII characters. Data format Start bit: 1 bit

Data bit: 7 bits Parity : Even (No parity/Odd), Selectable

Stop bit: 1 bit (2 bits), Selectable Error detection : LRC (Longitudinal Redundancy Check) Data interval : 1 second or less

(1) Message configuration

ASCII mode message is configured to start by Header [: (colon)(3AH)] and end by Delimiter [CR (carriage return) (0DH) + LF (Line feed)(0AH)].

Header

(:)

Slave

address

Function

code

Data

Error check

LRC

Delimiter

(CR)

Delimiter

(LF)

Slave address

Slave address is an individual instrument numb er on the slave side and is set within the range 0 to 95 (00H to 5FH). The master identifies slaves by the slave address of the requested message. The slave informs the master which slave is responding to the master by pl acingits own address in the response message. Slave address 0 (00H, broadcast address) can identify all the slaves. However slaves do not respond.

Function code

Thefunctioncode isthe command codefor the slaveto undertakethe following actiontypes.

Functioncode Contents

03 (03H) Reading the set value and information from slaves

06 (06H) Setting to slaves Function code is used to discern whether the response is normal (acknowledgement) or if any error (negative acknowledgement)has occurred whenthe slave returns ther esponse messageto the master. When acknowledgement is returned, the slave simply returns the original function code. When negative acknowledgement is return ed, the MSB of the original f unction code is set as 1 for the response. For example, when the master sends request message setting 10H t o the function code by mistake, slave returns 90H by setting the MSB to 1, because the former is an illegal function. For negative acknowledgement, the exception c odes below are set to the data of response message and returned t o the master in order to inform it of what k ind of error has occurred.

Exception code Contents

1 (01H) Illegal function (Non-existent function) 2 (02H) Illegal data address (Non-existent data address)

3 (03H) Illegal data value (Value out oft he setting range) 17 (11H) Shinkoerror code 4 (Status unable to beset, e.g. AT isperforming) 18 (12H) Shinko error code 5 (During setting mode by keypad operation)

Data

Data depends on the function code. Ar equest messagefrom the masteris composed ofdata item, numberof data ands etting data. Ar esponse message fromthe slave is composed of number of bytes,data and exception code in negative acknowledgements. The number of data to be dealt with in one message is “1”. Therefore, the number of data is fixed as (30H) (30H) (30H) (31H). Effective range of data is -32768 to 32767 (8000H to 7FFFH).

Error check: 2-character data to detect communication errors.

Refer to (2) Error check of ASCII mode below.

(2) Error check of ASCII mode

After calculating LRC (Longitudinal Redundancy Check) from the slave address to the end of data, the calculated 8-bit data is converted to two ASCII characters and are appended to the end of message.

[How to calculate LRC]

Create a message in RTU mode.

Add all the values from the slave address to the end of data. This is assumed as X.

Make a complement for X (bit reverse). This is assumed as X.

Add a value of 1 to X. This is assumed as X.

Set X as an LRC to the end of the message.

Convert the whole message to ASCII characters.

6.3 RTU mode

8-bit binary data in command is transmitted as it is. Data format Start bit: 1 bit

Data bit: 8 bits Parity : No parity (Even, Odd), Selectable

Stop bit: 1 bit (2 bits), Selectable Error detection: CRC-16 (Cyclic Redundancy Check) Data interval: 3.5 characters transmission time or less

(1) Message configuration

RTU mode is configured to start after idle time is processed for more than 3.5 character transmissions and end after idlet imeis pr ocessedfor more than 3.5 character transmissions.

3.5 idle

characters

Slave

address

Function

code

Data

Error check

CRC-16

3.5 idle

characters

Slave address : The same as that of ASCII mode Function code : The same as that ofA SCII mode Data : Data depends on the function code.

Communication parameter setting

Set each communication parameter following the procedures below.

(1)

(Approx.3sec)

Proceed to Auxiliary function setting mode.

Press the key for approx. 3sec while pressing the key in the PV/SV display mode.

The unit proceeds to Auxiliary function setting mode.

(2)

(Twice)

Auxiliary function setting mode

Press the key twice. The unit proceeds to Communication protocol selection.

(3) Communication protocol selection

Select the communication protocol.

: Shinko protocol (Default) : Modbus ASCII mode : Modbus RTU mode

(4) Instrument number setting

Set the instrument number of the c ontroller individually when communicating by connecting plural instruments.

0 to 95 (Default: 0)

(5) Communication speed selection

Set the c ommunication speed equal to t hat of the host computer.

: 2400bps : 4800bps : 9600bps (Default) : 19200bps

(6) Data bit/Parity selection

Select the data bit and parity.

: 8 bits/No parity : 7 bits/No parity : 8 bits/Even : 7 bits/Even (Default) : 8 bits/Odd : 7 bits/Odd

(7) Stop bit selection

Select the stop bit.

: 1 (Default) : 2

4. Communication procedure

Communication starts with command transmission from the host computer (Master) and ends with the response of the ACS-13A (Slave).

RS-485 communication timing

Master side (Notice on programming)

Set the program so that the master can disconnect the transmitter from the communication line within a 1 character transmission period after sending the command in preparation for reception of the response from the slave. To avoid the c ollision of transmissions between the master and the slave, s end the next command after carefully checking that the master received the response. If a response to the command is not returned due to communication errors, set the Retry Processing so as to send the command again. (Retry twice or more is recommended.)

Slave side

Whent heslave startstransmission through a communication line, the slaveis arranged so as to provide an idle status (mark st atus) transmission period of 1 or more characters before sendingthe response toensure synchronization onth ereceiving side. The slave is arranged so as to disconnectthe transmitter from the communication line within a 1 character transmission period after sending the response.

Shinko protocol

5.1 Transmission mode

Shinko protocol is composed of ASCII codes. Hexadecimal (0 to 9, At oF), which is divided into high order (4-bit) and low order (4-bit) out of 8-bit binary data in command is transmitted as ASCII characters. Data format Start bit: 1

Data bit: 7 bits Parity : Even Stop bit : 1 bit

Error detection: Checksum

5.2 Command configuration

All commands are composed of ASCII. The data (set value, decimal) is converted to hexadecimal numbers. A negative number is represented by 2's complement. Numerals written below the command represent number of characters.

(1) Setting command

Header

(02H)

Address

Subaddress

(20H)

Command type(50H)

Data item

Data Checksum

Delimiter

(03H)

1 1 1 1 4 4 2 1

(2) Reading command

Header

(02H)

Address

Subaddress

(20H)

Command type(20H)

Data item

Checksum

Delimiter

(03H)

1 1 1 1 4 2 1

(3) Response with data

Header

(06H)

Address

Subaddress

(20H)

Command type(20H)

Data item

Data Checksum

Delimiter

(03H)

1 1 1 1 4 4 2 1

(4) Acknowledgement

Header

(06H)

Address Checksum

Delimiter

(03H)

1 1 2 1

(5) Negative acknowledgement

Header

(15H)

Address Error code Checksum

Delimiter

(03H)

1 1 1 2 1

Header : Control code to represent the beginning of the command or the response.

ASCII codes are used. Setting command, Reading command : STX (02H) fixed Response with data, Acknowledgement : ACK(0 6H)f ixed Negative acknowledgement : NAK (15H) fixed

Instrument number (Address): Numbers by which the master discerns each slave.

Instrument number 0 to 94 and Global address 95. ASCII codes (20H to 7FH) are used by adding 20H toinstr ument numbers 0 to 95 (00H to 5FH). 95 (7F H) is called Global address, which is used when the same command is s ent to all th e slaves connected. However, the response is not returned.

Sub address : 20H fixed Commandtype: Code to discern Setting command (50H) and Reading command (20H) Data item : Data classification of the command object. Composed of hexadecimal

4 digits, using ASCII.(Refer to7. Communicationcommand table)

Data : The contents of data (set value) differ depending on the setting command.

Composed of hexadecimal 4 digits, using ASCII. (Refer to 7. Communication command table)

Checksum : 2-character data to detect communication errors (Refer to section 5.3.) Delimiter : ASCII code ETX(03H)fixed. Controlcode torepresent theend ofcommand. Error code : Represents an error type with ASCII codes.

1 (31H)-----Non-existent command 2 (32H)-----Not used 3 (33H)-----Setting out of the setting range 4 (34H)-----Status unable to be set (e.g.AT is performing) 5 (35H)-----During setting mode by keypad operation

5.3 Checksum calculation

Checksum is used to detect receiving errors in the command or data. Set the program for the master side as well to calculate the checksum of the response data from the slaves so that the communication errors can be checked. The ASCII code (hexadecimal) corresponding t o the ch aracters which r ange from the address to that before the checksum is converted t o binary notation, and the total v alue is calculated. The lower 2-digits of th et otal value are converted to 2’s complement, and then to hexadecimal numbers, that is, ASCII code for the checksum.

Checksum calculation example

SV: 600 (0258H) Address (instrument number): 0 (20H)

• 1’s complement: Reverse each binary bit. 0 will become 1 and vice versa.

• 2’s complement: Add 1 to 1’s complement.

A request message from the master is composed of data item, number of data and

setting data. A response message from the slave is composed of number of bytes, data and exception codes in negative acknowledgement. The number of data to be dealt with in one message is “1”. Therefore the number of data is fixed as 0001H. The number of response byte is 02H. Effective range of data is -32768 to 32767 (8000H to 7FFFH).

Errorcheck:16-bit datato detectcommunication errors.Referto “(2)Errorcheckof RTUmode”.

(2) Error check of RTU mode

After calculating CRC-16 (Cyclic Redundancy Check) from the slave address to the end of data, the calculated 16-bit d ata is appended to the end of message i n sequence from low order to high order.

How to calculate CRC-16

In the CRC-16 system, the information is divided by polynomial series. The remainder is addedt othe end of theinformation and transmitted.The generation ofpolynomial series is as follows. (Generation of polynomial series: X16+ X15+ X2+ 1)

Initialize the CRC-16 data (assumed as X) (FFFFH).

Calculate exclusive OR (XOR) with the 1st data and X. This is assumed as X.

Shift X one bit to the right. This is assumed as X.

When a carryis generated asa result of theshift, XOR isc alculated byX of3and the fixed value (A001H). This is assumed as X. If a carry is not generated, go to step5.

Repeat steps3and4until shifting 8 times.

XOR is calculated with the next data and X. This is assumed as X.

Repeat steps3to5.

Repeat steps3to5up to the last data.

Set X as CRC-16 to the end of the message in sequence from low order to high order.

7. Communication command table

Shinko

commandtype

Modbus

functioncode

Data item Data

20H/50H 03H/06H 0001H SV Set value,Decimalpointignored 20H/50H 03H/06H 0003H Auto-tuning/Auto-r eset 0000H: Cancel

0001H: Perform 20H/50H 03H/06H 0004H OUT1 proportional band Setvalue,Decimalpointignored 20H/50H 03H/06H 0005H OUT2 proportional band Setvalue,Decimalpointignored 20H/50H 03H/06H 0006H Integral time Set value 20H/50H 03H/06H 0007H Derivative time Set value 20H/50H 03H/06H 0008H OUT1 proportional cycle Set value 20H/50H 03H/06H 0009H OUT2 proportional cycle Set value 20H/50H 03H/06H 000BH Alarm 1 value Set value,Decimalpointignored 20H/50H 03H/06H 000CH Alarm 2 v alue Setvalue,Decimalpointignored 20H/50H 03H/06H 000FH Heater burnoutalarm value Set value,Decimalpointignored 20H/50H 03H/06H 0012H Set value lock 0000H:Unlock 0002H:Lock2

0001H:Lock1 0003H: Lock3 20H/50H 03H/06H 0015H Sensor correction Setvalue,Decimalpointignored 20H/50H 03H/06H 0016H Overlap/Dead band Set value 20H/50H 03H/06H 0018H Scaling high limit Setvalue,Decimalpointignored 20H/50H 03H/06H 0019H Scaling low limit Set value,Decimalpointignored 20H/50H 03H/06H 001AH Decimal point place 0000H:xxxx 0002H: xx.xx

0001H:xxx.x 0003H:x.xxx 20H/50H 03H/06H 001BH PV filter time constant Setvalue,Decimalpointignored 20H/50H 03H/06H 001CH OUT1 high limit Set value 20H/50H 03H/06H 001DH OUT1 low limit Set value 20H/50H 03H/06H 001EH OUT1 ON/OFF hysteresis Setvalue,Decimalpointignored 20H/50H 03H/06H 001FH OUT2 action mode 0000H: Air cooling

0001H: Oil cooling

0002H: Water cooling 20H/50H 03H/06H 0020H OUT2 high limit Set value 20H/50H 03H/06H 0021H OUT2 low limit Set value 20H/50H 03H/06H 0022H

OUT2 ON/OFF hysteresis

Set value,Decimalpointignored

Alarm 1 type20H/50H 03H/06H 0023H 0000H: No alarm action 0001H: High limit alarm 0002H: Low limit alarm 0003H: H/L limits alarm 0004H: H/L limit range

0005H: Process high alarm

0006H: Process low alarm

0007H: High limit w/standby

0008H: Low limit w/standby

0009H: H/L limits w/standby 20H/50H 03H/06H 0024H Alarm 2 type Thes ame asAlarm 1 type 20H/50H 03H/06H 0025H Alarm 1 hysteresis Setvalue,Decimalpointignored 20H/50H 03H/06H 0026H Alarm 2 hysteresis Setvalue,Decimalpointignored 20H/50H 03H/06H 0029H Alarm 1 action delay timer S etv alue 20H/50H 03H/06H 002AH Alarm 2 action delay timer Set value 20H/50H 03H/06H 0032H Indication when output

OFF

0000H: OFF indication

0001H: No indication

0002H: PV indication

0003H: PV+ Alarm action 20H/50H 03H/06H 0033H SV rise rate Set value,Decimalpointignored 20H/50H 03H/06H 0034H SV fall rate Set value,Decimalpointignored 20H/50H 03H/06H 0037H Control output OUT/OFF 0000H: Control output ON

0001H: Control output OFF 20H/50H 03H/06H 0038H Auto/Manual contr ol 0000H:Automatic control

0001H: Manual control 20H/50H 03H/06H 0039H Manual control MV Set value 20H/50H 03H/06H 0040H Alarm 1 Energized/

De-energized

0000H: Energized

0001H: De-energized 20H/50H 03H/06H 0041H Alarm 2 Energized/

De-energized

0000H: Energized

0001H: De-energized

Shinko

commandtype

Modbus

functioncode

Data item Data

Input type 0000H: K -200 to 1370 0001H: K -200.0 to 400.0 0002H: J -200 to 1000 0003H: R 0 to 1760 0004H: S 0 to 1760 0005H: B 0 to 1820 0006H: E -200 to 800 0007H: T -200.0 to 400.0 0008H: N -200 to 1300 0009H: PL- 0 to 1390 000AH: C(W/Re5-26)

0 to 2315

000BH: Pt100

-200.0 to 850.0

000CH: JPt100

-200.0 to 500.0

000DH: Pt100

-200 to 850

000EH: JPt100

-200 to 500

000FH: K -320 to 2500 0010H: K -320.0 to 750.0 0011H: J -320 to 1800 0012H: R 0 to 3200 0013H: S 0 to 3200 0014H: B 0 to 3300 0015H: E -320 to 1500 0016H: T -320.0 to 750.0 0017H: N -320 to 2300 0018H: PL- 0 to 2500 0019H: C(W/Re5-26)

0 to 4200

001AH: Pt100

-320.0 to 1500.0

001BH: JPt100

-320.0 to 900.0

001CH: Pt100

-320 to 1500

001DH: JPt100

-320 to 900

20H/50H 03H/06H 0044H

001EH: 4 to 20mA 001FH: 0 to 20mA 0020H: 0 to 1V 0021H: 0 to 5V 0022H: 1 to 5V 0023H: 0 to 10V

-2000 to 10000

20H/50H 03H/06H 0045H Direct/Reverse action 0000H: Reverse action

0001H: Direct action 20H/50H 03H/06H 0047H AT bias Set value 20H/50H 03H/06H 0048H ARW Set value 20H/50H 03H/06H 0049H Heaterburnoutalarm2 value Setvalue,Decimalpointignored 20H/50H 03H/06H 004AH OUT1rate-of-change Set value

Backlight20H/50H 03H/06H 0050H 0000H: All are backlit 0001H: PV display backlit 0002H: SV display backlit 0003H: Action indicators backlit 0004H: PV+SV displays backlit 0005H: PV+Action indicators backlit 0006H: SV+Action indicators backlit PV color20H/50H 03H/06H 0051H 0000H: Green 0001H: Red 0002H: Orange 0003H: When Alarm ON:

Green Red

0004H: When Alarm ON:

Orange R ed 0005H:PV continuouschange 0006H:PV c ontinuous

change+ Alarm ON, Red 20H/50H 03H/06H 0052H PV color range Set value,Decimalpointignored 20H/50H 03H/06H 0053H Backlight time Set value

50H 06H 0 070H Key operation change

flag clearing

0000H: No action 0001H: Clear all

20H 03H 0 080H PV (Process variable) Current PV (Process vari-

able), Decimal point ignored 20H 03H 0 081H OUT1 MV OUT1MV,Decimal pointignored 20H 03H 0 082H OUT2 MV OUT2MV,Decimal pointignored 20H 03H 0 083H SV (When SVrises orfalls) Current SV (Desired value),

Decimal point ignored

Status flag20H 03H 0085H 20: OUT1

21: OUT2 22: Alarm 1 output 23: Alarm 2 output 26:

Heaterburnoutalarmoutput

28: Overscale 29: Underscale 210: Controloutput OUT/OFF 211: During AT/Auto-reset 212: OUT/OFFkeyfunction

214: Auto/Manual control 215: Changein keyoperation 24, 25, 27, 2

0: OFF, 1: ON

(DCcurrent output:Not fixed)

0: OFF, 1: ON

(Whensensorburnout,0: OFF)

0: OFF, 1: ON

0: ON, 1: OFF

0: OFF, 1: DuringAT/Auto-reset

0: OUT/OFF function

1: Auto/Manual control

0: Auto, 1: Manual

0: No, 1: Yes

Not used, Always 0 20H 03H 0 086H CT1 current value CT1 current v alue,

Decimal point ignored 20H 03H 0 087H CT2 current value CT2 current v alue,

Decimal point ignored

8. Specifications

Cable length : 1.2km (Max.), Cable resistance: 50 or less (Terminators are not

necessary, but if used, use 120 or more on one side.) Communication line : EIA RS-485 Communication method: Half-duplex communication Communication speed : 9600bps (2400, 4800, 19200bps) Selectable by keypad Synchronization method : Start-stop synchronization Code : ASCII, Binary Error correction : Command request repeat system

Shinko Technos. Co., Ltd. U RL: http://www.shinko-technos.co.jp 2-5-1, Senbahigashi,Minoo,Osaka, Japan TEL:81-72-727-6100 FAX: 81-72-727-7006

•

Response with d

ata

When the master sends the reading command, the slave responds with the corresponding set v alue or current status.

•

Acknowledgement

When the master sends the setting command, the slave responds by sending the ackn owledgement after th e processing is terminated.

•

Negative acknowledgement

When the master sends a non-existent command or

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

•

No response

The slave will not respond to the master in the following cases:

• Global address, Broadcast address (Modbus protocol) is set.

• Communication error (framing error, parity error)

• Checksum error (Shinko protocol)

• LRC discrepancy (Modbus ASCII mode)

• CRC-16 discrepancy (Modbus RTU mode)

Master Slave

Command

Data

Command

Acknowledgement

Command

Negative

Acknowledgement

Command

No response

STX ETX

P 0 0 0 1 0 2 5 8

02H 20H 20H 50H 30H 30H 30H 31H 30H 32H 35H 38H 03H

[Characters abovea rerepresented by ASCII]

Checksum

Checksum calculation range

[e.g.]

45H 30H

20H 20H 50H 30H 30H 30H 31H 30H 32H 35H 38H

0010 0000 0010 0000 0101 0000 0011 0000 0011 0000 0011 0000 0011 0001 0011 0000 0011 0010 0011 0101 0011 1000

10 0010 0000

[Hexadecimal] [Binary]

1101 1111

1110 0000

E 0

45H

30H

[1's complement]

[2's complement]

[Hexadecimal]

[ASCII]

Checksum

Host computer

D-sub 9-pin connector

ACS-13A (Max. 31 units)

Host computer

Shielded

wire

Shielded wire

Communication Instruction Manual ACS-13A (C5)

No. ACS11CJE4 2011.04

This manual contains instructions forcommunicationfunctions. For detailed operating instructions, please download the detailed Communication instruction manual for the ACS-13A( C5) at http://www.shinko-technos.co.jp/e/ by clicking “Download”.

1. System configuration

(Fig. 1-1)

2. Wiring

Wiring examples when using a communication converter IF-400

Shieldedwire

Connect only one side of the shielded wire to the FG terminal so that current cannot flow to the shielded wire. If both sides of the shielded wireare connected to the FG terminal, the circuit will be closed between the shielded wire and the ground. As a result,current will run through theshielded wireand thismay causenoise.Be sureto ground theFG terminal.

Terminator(Terminal resistor)

ThecommunicationconverterIF-400(sold separately)has a built-interminator. The terminator ismounted atthe end of thewire whenc onnecting apersonal computerwith multiple peripheral devices. The terminator prevents signal reflection and disturbance. Do not connect terminator with the communication line because each ACS-13A has built-in pull-up andpull-downresistors insteadof a terminator.

ACS-13A

No. 0

ACS-13A

No. 1

ACS-13A

No. 30

Communication converter IF-400

RS-232C RS-485

(Fig. 2-1)

D-sub 25-pin connector

(Fig. 2-2)

ToACS-13A

Shielded wire

Host computer

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