A simple example of a Write_VAR application for an M340 PLC
Goals and Symptoms
Simple example of WRITE_VAR Ethernet communication for M340
Causes and Fixes
The Ethernet communications can be confusing to program using Unity, since they vary from PAC family to family. This is one of a series of example applications that presents each function block in a working version for the user to build on.
Additional Information
The attached application write_var.zef will write ten registers to another device. (The code for a server M340 is also attached). The application consists of two sections, The first is an ST section in which variables are initialized, and the array to be written is filled. The second section, which is the example proper is a LD section which simply uses an ADDM block to feed the address to the WRITE_Var function block. The main area of difficulty is the formatting of the address. See the help in Unity Pro. In this example the format ‘NETWORK{SERVERIP.EN_US}’ is used; where NETWORK is the name given to the network associated with the client device (sender), and SERVERIP is the IP address of the server (target). In the example the IP address of the client is 192.168.1.23, The IP of the server is 192.168.1.30. These should be changed to suit your own addressing scheme. The application is annotated and should provide a start for the user of the WRITE_VAR block.
Simple example of WRITE_VAR Ethernet communication for M340
Causes and Fixes
The Ethernet communications can be confusing to program using Unity, since they vary from PAC family to family. This is one of a series of example applications that presents each function block in a working version for the user to build on.
Additional Information
The attached application write_var.zef will write ten registers to another device. (The code for a server M340 is also attached). The application consists of two sections, The first is an ST section in which variables are initialized, and the array to be written is filled. The second section, which is the example proper is a LD section which simply uses an ADDM block to feed the address to the WRITE_Var function block. The main area of difficulty is the formatting of the address. See the help in Unity Pro. In this example the format ‘NETWORK{SERVERIP.EN_US}’ is used; where NETWORK is the name given to the network associated with the client device (sender), and SERVERIP is the IP address of the server (target). In the example the IP address of the client is 192.168.1.23, The IP of the server is 192.168.1.30. These should be changed to suit your own addressing scheme. The application is annotated and should provide a start for the user of the WRITE_VAR block.
Publié pour: Schneider Electric Belgium
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