Lenze I/O system 1000 System Manual - Manual (Page 719)

Modbus TCP Kommunikation
Access to the I/O system 1000
Function codes
13
l
719 EDSIO1000 EN 7.0
13.2.2 Function codes
The following function codes can be used to access a slave by a Modbus master. The
description is always made from the master’s view:
Code Command Description
01
h
Read n bits Read n bits from the master output range 0x
02
h
Read n bits Read n bits from the master input range 1x
03
h
Read n words Read n words from the master output range 4x
04
h
Read n words Read n words from the master input range 3x
05
h
Write 1 bit Write 1 bit in the master output range 0x
06
h
Write 1 word Write 1 word in the master output range 4x
0F
h
Write n bits Write n bits in the master output range 0x
10
h
Write n words Write n words in the master output range 4x
16
h
Mask 1 word Mask 1 word in the master output range 4x
17
h
Write n words and read m words Write n words in the master output range 4x and
the response contains m read words of the master
input range 3x
The following always applies to the byte order in the word: HIGH byte | LOW byte
Response of the bus coupler
If the slave returns an error, the function code is returned in an OR−ed manner with 80
h
. If
no error has occurred, the function code is returned.
Coupler response:
Function code OR 80
h
® error & error number
Function code
® OK
In the event of an error you will receive additionally an error number in another byte. Here,
the following error numbers exist:
01
h
: Function number is not supported
02
h
: Faulty addressing
03
h
: Faulty data
04
h
: System SLIO bus is not initialised
07
h
: General error
Read n bits
Code 01
h
: Read n bits of master output range 0x.
Code 02
h
: Read n bits of master input range 1x.
Command frame:
Modbus TCP header Slave address Function
code
Address
1. bit
Number
Bits
x x 0 0 0 6
6 bytes 1 byte 1 byte 1 word 1 word
Response message:
Modbus TCP header Slave address Function
code
Number of
read bytes
Data
1. byte
Data
2. byte
...
x x 0 0 0
6 bytes 1 byte 1 byte 1 byte 1 byte 1 byte
max. 252 bytes