Baumer ETTNM Uživatelský manuál stáhnout pdf (Strana 3)

Read Coil Status - function code 01

The master queries the TEDM/ETTNM about the coils’ status.

The start address for reading the coils is ﬁxed and the number of coils is always 16. Coils are always addressed starting from zero: so

coils 1-16 are addressed as 0-15.

Transmission samples

Sample response to the query:

Response

Field name Example

Slave Address 3B hex

Function 01 hex

Byte Count 02 hex

Data (Coils 08-01) 21 hex

Data (Coils 16-09) 00 hex

Error Check (CRC) —

The status of the coils (08-01) results in the byte value 21

hex, or 0010 0001 in binary, so coil 1 is active.

Coil 1 conﬁgured as NO and Coil 2 conﬁgured as NC.

Bit = 0: NC conﬁguration. Bit = 1: NO conﬁguration.

Read Holding Register - function code 03

The master queries the TEDM/ETTNM on the value of the reading, the code, the setting of the high and low switching points of the timers for the coils.

The query indicates the register address to be read. Registers are always addressed starting from zero: so registers 1-11 are addressed as 0-10.

Sample response to the query:

Response

Field name Example

Slave Address 3B hex

Function 03 hex

Byte Count 02 hex

Data Hi (Register 1) 0A hex

Data Lo (Register 1) 2B hex

Error Check (CRC) —

For register 1: The content results in the value of two bytes

0A 2B hex or 2603 decimal.

Sample command to read coils 16-01 of slave 59:

Query

Field name Example

Slave Address 3B hex

Function 01 hex

Starting Address Hi 00 hex

Starting Address Lo 00 hex

No. of Points Hi 00 hex

No. of Points Lo 10 hex

Error Check (CRC) —

Sample request to read register 1 (measured value) of slave 59:

Query

Field name Example

Slave Address 3B hex

Function 03 hex

Starting Address Hi 00 hex

Starting Address Lo 00 hex

No. of Points Hi 00 hex

No. of Points Lo 01 hex

Error Check (CRC) —

For more information about the Modbus protocol go to: http://www.modbus.org/

Addr.

Coil

Action

00 Status Coil 1

01 Status Coil 2

04 NO-NC 1

05 NO-NC 2

08 Position

09 of

10 decimal

11 point

Addr.

Reg

Action

Value measured

01 Code

02 Value HSP1

03 Value LSP1

04 Value HSP2

05 Value LSP2

07 Value TS1

08 Value TH1

09 Value TS2

10 Value TH2

Write Single Coil - function code 05

This function code is used to remotely conﬁgure coils as NO or NC. The coils involved are 05 (NO) and 06 (NC) with addresses adr 04

and adr 05 respectively.

The slave conﬁrms the write action by sending back the

same message.

Sample response to the query:

Response

Field name Example

Slave Address 3B hex

Function 05 hex

Starting Address Hi 00 hex

Starting Address Lo 04 hex

No. of Points Hi FF hex

No. of Points Lo 00 hex

Error Check (CRC) —

Coil 1 is conﬁgured as NO.

To conﬁgure a coil as NO, the value FF 00 hex is sent to the slave.

To conﬁgure a coil as NC, the value 00 00 hex is sent to the slave.

Sample request to set coil 05 of slave 59 to 1.

The master transmits the value FF 00:

Query

Field name Example

Slave Address 3B hex

Function 05 hex

Starting Address Hi 00 hex

Starting Address Lo 04 hex

No. of Points Hi FF hex

No. of Points Lo 00 hex

Error Check (CRC) —

Write Single Register - function code 06

This function code is used to remotely conﬁgure the access code*, the high and low switching points for the coils, the timer for the coils, the

address of the TEDM or ETTNM.

The query indicates the register address involved. The registers are always addressed starting from 1: registers 2-11 are addressed as 1-10.

Please note: the switching values, the access code and the slave address are inserted in the respective registers in hexadecimal.

Sample request to write the set point for slave 59:

Query

Field name Example

Slave Address 3B hex

Function 06 hex

Starting Address Hi 00 hex

Starting Address Lo 02 hex

No. of Points Hi 00 hex

No. of Points Lo 6E hex

Error Check (CRC) —

* access code for conﬁguration from the front of the TEDM or ETTNM.

Sample response to the query:

Response

Field name Example

Slave Address 3B hex

Function 05 hex

Starting Address Hi 00 hex

Starting Address Lo 02 hex

No. of Points Hi 00 hex

No. of Points Lo 6E hex

Error Check (CRC) —

The set point for coil 1 is set to 00 6E hex or 110 decimal.

Adr.

Reg

Action

01 Code

02 Value HSP1

03 Value LSP1

04 Value HSP2

05 Value LSP2

06 Slave addr.

07 Value TS1

08 Value TH1

09 Value TS2

10 Value TH2

Addr.

Coil

Action

04 NO-NC 1

05 NO-NC 2

320124 ind a 11/2012

1 2 3 4

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