FANUC Robotics America GFK-1541B User Manual

Page 124

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GFK-1541B

Chapter 4 Programming Modbus/TCP Channel Commands

4-9

4

Command 3000 Example

Establish a channel (Channel 5) to a remote Modbus/TCP device at IP address 10.0.0.1. Return
the COMMREQ Status word to %R10.

Dec (Hex)

Word 1

00008 (0008)

Length of Channel command Data Block

Word 2

00000 (0000)

Always 0 (no-wait mode request)

Word 3

00008 (0008)

Memory type of CRS word (%R)

Word 4

00009 (0009)

CRS word address minus 1 (%R10)*

Word 5

00000 (0000)

Reserved

Word 6

00000 (0000)

Reserved

Word 7

03000 (0BB8) Open Modbus/TCP Client Connection

Word 8

00005 (0005)

Channel number (5)

Word 9

00001 (0001)

Remote Device Address Type

Word 10

00004 (0004)

Length of Remote Device Address

Word 11

00010 (0010)

Numeric value of 1

st

Octet

Word 12

00000 (0000)

Numeric value of 2

nd

Octet

Word 13

00000 (0000)

Numeric value of 3

rd

Octet

Word 14

00001 (0001)

Numeric value of 4

th

Octet

* Word 4 (CRS word address) is the only zero-based address in the Command Block. Only this

value requires subtracting 1 from the intended address.

(Word 7) Channel Command Number:

Word 7 is the command id for an Open Modbus/TCP

Client Connection COMMREQ. If successful a TCP connection with the specified device is
allocated.

(Word 8) Channel Number:

Word 8 specifies the channel number to allocate for the Modbus/TCP

Client connection. Channels 1-16 can be used for Client communications.

(Word 9) Address Type:

Word 9 specifies the type of IP Address specified for the remote device.

A value of one (1) is required in this word.

(Word 10) Length of IP Address:

Word 10 specifies the length of the IP Address. A value of

four (4) is required in this word.

(Word 11) IP Address 1

st

Octet:

Word 10 specifies the value of the first octet of the IP Address.

(Word 12) IP Address 2

nd

Octet:

Word 11 specifies the value of the second octet of the IP

Address.

(Word 13) IP Address 3rd Octet:

Word 12 specifies the value of the third octet of the IP

Address.

(Word 14) IP Address 4th Octet:

Word 13 specifies the value of the fourth octet of the IP

Address.

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