KM002100G MDW Serial Protocol Up to Version 6 05

7/25/2019 KM002100G MDW Serial Protocol Up to Version 6 05

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Service Book KM002100G

Serial protocol for MDW


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1. MODBUS PROTOCOL FOR PIOVAN EQUIPMENT (MDW)

1.1. Electronic interface

The electronic interface installed on the Piovan Micro Processor controller is RS485. The serial communication line can link

up to 31slaves. The wiring between the serial communication line and the Piovan Micro Processor controller is done

through screw terminals.

1.2. Network configuration

MOD-BUS protocol is suitable for a 1-master / 255-slave network. The number of possible slaves can be limited by the elec-

tronic interface used.

The Piovan Micro Processor controller works as a slave.

1.3. Transmission format

This protocol uses a binary method, composed as follows:

1 start bit, 8 data bits, 1 parity bit (optional), 1 stop bit.

The communication speed can be selected from among 1200, 2400, 4800, 9600 and 19200 baud.

1.4. Communication procedure

The communication can be started only from the master unit. The slave unit can transmit only after a query from the master.

The general format of the master / slave transmission is the following:

The slave recognizes the transmission of a query frame when the time between two characters is greater than 3 T.U.(T.U. = time unit = necessary time to transmit one character).

1.5. Function code 1 and 2: reading of "n" bit

These function codes are used by the master unit to request the value of a certain number of bits, that represent the status

of the slave unit.

The slave answers the following:

Range Byte

Slave address 1

Function code 1

Data n

Error check (crcl6) 2

Range Byte

Slave address (1-255) 1

Function code (01-02) 1

Bit starting address (high byte) 1

Bit starting address (low byte) 1

Number of bits (high byte) 1

Number of bits (low byte) 1

Error check (crc16) 2

Range Byte



Byte count 1

Data n

Error check (crcl6) 2


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The "data" field indicates the bit requested: the bit with lower address is the bit 0 of the first byte, the next is the bit 1 and

so on.

The possible bit necessary to complete the last byte must be put at 0.

1.6. Function code 3 and 4: reading of n word

These function codes are used by the master unit to read a group of words (16 bit) which contains the value of the variable

of the slave unit.


The "data" field indicates the requested words in the following format: high byte of the first word, low byte of the first word,

high byte of the second word, and so on.

For addresses not implemented, the "data" field will show 8000h.

1.7. Function code 5: bit writing

By using this command, the master unit can change the status of one bit of the slave unit.


"Data" field = 0 to reset the bit

= FF00h to set the bit

Range Byte



Word starting address (high byte) 1

Word starting address (low byte) 1

Number of word (high byte) 1

Number of word (low byte) 1


Range Byte



Byte count 1

Data n


Range Byte


Function code (05) 1

Bit address (high byte) 1

Bit address (low byte) 1

Data 2


Range Byte



Bit address (high byte) 1

Bit address (10w byte) 1

Data 2

Error check (crci6) 2


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1.8. Function code 6: word writing

By using this command, the master unit can change the status of one word of the slave unit.


1.9. Function code 15: writing of "n" bit

By using this command, the master unit can change the status of one or more bits of the slave unit.


Range Byte



Word address (high byte) 1

Word address (low byte) 1

Data 2


Range Byte


Function code (06) 1Word address (high byte) 1

Word address (low byte) 1

Data 2


Range Byte


Function code (i5) 1





Number of data bytes 1

Data n


Range Byte









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1.10. Function code 16: writing of n word

By using this command, the master unit can change the state of one or more words of the slave unit.


NOTES:

"Broadcast" address

When using writing codes 5 and 6, the address 0 of the slave units is allowed. In this case all the slaves

connected accept the command but do not give any answer.

Words format

Every time the information transfer is made by using 2 byte (1 word of 16 bit), the first byte transmitted is

the most significant. For the negative numbers is used the "two complement" format.

Error reply

The slave unit can find out errors in the master query.

If the "error check" is incorrect or the function code is not implemented, the slave does not send any an-

swer to the master.

If other errors are detected on query frame, the slave replies forcing at "1" the bit 7 of the byte "Function

code" and gives an error code.

Error reply

List of error code

Range Byte





Number of words (high byte) 1

Number of words (low byte) 1

Number of data bytes 1

Data n


Range Byte





Number of words (high byte) 1

Number of words (low byte) 1


Range Byte

Slave address 1

Function code (+80h) 1

Error code 1


Meaning Error #.

illegal data address 2

illegal data value 3

illegal number of data 9

the bit or word indicated cannot be modified 10


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Answer time

The slave replies from 2 ms to 700 ms after the end of a query. (That is detected counting the received

bytes).

Decimal digits/ negative numbers

In case of transmission of decimal digits and/or negative numbers, please see example.

Example:Number to transmit 205.6 -----------> 2056 is transmitted

Number to transmit -12.50 ----------> -1250 is transmitted

WORDS

Address Description Type Digits M.U. Notes

27 COMMENT OF RECIPE IN PROGRESS R/W

10 working SET of STATION 2 R/W xx,x %





15 Alarm mode and calculation type of STATION 1 R/W x 1






21 number of process recipe turbo-cycles R/W

22 rotation time of process recipe mixer R/W xxx s

23 weight of process batch R/W xx.x kg

24,25 weight of process mixture R/W xxxxx hg

26 % added to station 2 for slr1 R/W xx.x

27 % added to station 2 for slr2 R/W xx.x

28 maximum instantaneous total production R xxxx kg/h

29 mdw controls W 8

30 mdw controls W 9

50 mdw state R 10

51 1..16 alarms R 11

52 17..32 alarms R 12

53 33..48 alarms R 13

54 state of digital inputs R 15

55 state of digital outputs R 16

56 or alarms R 17

63,64 Weight of material dosed on station 1 R xxxxx,x g






100 remote flag R/W 7


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NOTES

400,401 station 1 totalizator R xxxxx,xxx kg 36



406,407 station 4 totalizator R xxxxx,xxx kg 36408,409 station 5 totalizator R xxxxx,xxx kg 36


412,413 balance weight value R xxxxx,x g

414 % of material dosed on station 1 R xx,x






456,457 Weight of material to dose on station 1 R xxxxx,x g458,459 Weight of material to dose on station 2 R xxxxx,x g

460,461 Weight of material to dose on station 3 R xxxxx,x g




468,469 number of produced batches R xxxxxxxx

Note 1 Variable Description

1. [ON] read-only alarm

2. [ON]+[STOP] alarm and doser stop


From v 6.06.03: IF THE EXCHANGING FLAG OF STATIONS 2, 3 IS ON (note 30) SEE NOTE 3

1. [ON][TOT] read-only alarm and percentage referring to batch

2.[ON]+[STOP]

[TOT]alarm and doser stop and percentage referring to batch

3. [ON]+[2->1][TOT] alarm, dosage trans. to station 1 and percentage referring to batch

4. NOT APPLICABLE

5. [ON][1] read-only alarm and percentage referring to station 1

6. [ON]+[STOP][1] alarm and doser stop and percentage referring to station 1

7. [ON]+[2->1][1] alarm, dosage trans. to station 1 and percentage referring to station 1

Address Description Type Digits M.U. Notes


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Fromv 6.06.03: IF THE EXCHANGING FLAG OF STATIONS 2, 3 IS ON (note 30) SEE NOTE 2


2.[ON]+[STOP]

[TOT]alarm and doser stop and percentage referring to batch

3. [ON]+[3->1][TOT] alarm, dosage trans. to station 1 and percentage referring to batch

4.

[ON]+

[BATCH->1]

[TOT]

alarm, whole batch trans. to station 1 and percentage referring to batch

5. [ON][1] read-only alarm and percentage referring to station 1

6. [ON]+[STOP][1] alarm and doser stop and percentage referring to station 1

7.

[ON]+

[BATCH->1][1]

Up to v 6.06.02:alarm, whole batch trans. to station 1 and percentage referring

to batch 1

[ON]+[3->1][1]From v 6.06.03 on: alarm, dosage trans. to station 1 and percentage referring to

station 1

8.

[ON]+[3->1][1]Up to v 6.06.02:alarm, dosage trans. to station 1 and percentage referring to

station 1

[ON]+

[BATCH->1][1]

From v 6.06.03 on: alarm, whole batch trans. to station 1 and percentage refer-

ring to station 1

9.

Up to v 6.06.00: NOT APPLICABLE

[ON][1+3]From v 6.06.01 on: read-only alarm and percentage referring to the addition

[1+3]

10.


[ON]+

[STOP][1+3]

From v 6.06.01 on:alarm and doser stop and percentage referring to the addi-

tion [1+3]

11.


[ON]+[3->1][1+3]From v 6.06.01 on:alarm, dosage trans. to station 1 and percentage referring to

addition [1+3]

12.Up to v 6.06.00: NOT APPLICABLE

[ON]+

[BATCH->1][1+3]

From v 6.06.01 on: alarm, trans. of whole batch to station 1 and percentage

referring to addition [1+3]


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2. [ON]+[STOP][TOT] alarm and doser stop and percentage referring to batch

3.

[ON]+

[BATCH->1]

[TOT]

alarm, whole batch transfer to station 1 and percentage referring to the batch

4. NOT APPLICABLE

5. [ON][1] read-only alarm and percentage referring to the station 1

6. [ON]+[STOP][1] alarm and doser stop and percentage referring to the station 1

7.[ON]+

[BATCH->1][1]

alarm, whole batch trans. to station 1 and percentage referring to the station 1

8. NOT APPLICABLE

9. [ON][1+3] read-only alarm and percentage referring to the stations 1+3

10.[ON]+

[STOP][1+3]alarm and doser stop and percentage referring to the stations 1+3

11.


[ON]+

[BATCH->1][1+3]

From v 6.06.03 on: alarm, whole batch transfer to station 1 and percentage

referring to stations 1 + 3

12.

[ON]+[BATCH->1]

[1+3]

Up to v 6.06.02: alarm, whole batch transfer to station 1 and percentage referringto stations 1 + 3

From v 6.06.03 on:NOT APPLICABLE

Note 7 Description

0. local

1. remote

Note 8 (bit) Description

0. changed material start

1. alarms acknowledge

2. totalizators reset

3. alarms reset

4. unchanged material start


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0. stop


0. stop state

1. running state

2. pause state

3. local check state

4. calibration state

Note 11 (bit) Alarm Description

0. 1 material minimum level on station 1






6. 7 material flow failure on station 1






12. 13 deviation of station 1 dosage





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2. 19 weighing system reading error

3. 20 wrong functioning of lower slide gate

4. 21 printer not ready

5. 22 end of production (production preset)

6. 23 volumetric functioning of the doser

7. 24 safety devices intervention

8. 25 too low working set for station 1






14. 31 component not dosed by station 1







4. 37 wrong functioning of weigh pan

5. 38 dosage without station 2

6. 39 dosage with station 1 only

7. 40 mixer motor breakdown

8. 41 lacking batch (start again)

9. 42 overweight on weighing cell

10. 43 scanty doser steadiness

11. 44 dosage without station 3

12. 45 prealarm for maintenance of station 1





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0. hopper material level on station 1






6. mixer material level

7. material level below lower slide gate

8. safety devices

9. lower level on regrind accumulation tank

10. higher level on regrind accumulation tank

11.

12.

13.

14.

15.


0. dosage control of station 1






6. mixer control

7. weighing slide gate control

8. lower slide gate control

9. siren control

10. alarm exit control

11.

12.

13.

14.

15.


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0. any alarm

1. one alarm is present


- To zero the totalizators, use the MODBUS 29 address.

KM002100G MDW Serial Protocol Up to Version 6 05

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