Baumer ETTNM - Manual (Page 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:
Quer
y
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:
Quer
y
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
02
03
04 NO-NC 1
05 NO-NC 2
06
07
08 Position
09 of
10 decimal
11 point
12
13
14
15
Addr.
Reg
Action
00 Value measured
01 Code
02 Value HSP1
03 Value LSP1
04 Value HSP2
05 Value LSP2
06
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:
Quer
y
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:
Quer
y
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
00
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
00
01
02
03
04 NO-NC 1
05 NO-NC 2
06
07
08
09
10
11
12
13
14
15
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