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In this case the string is stored is string memory ST9:0 and has a length of 4 characters. If the string stored in ST9:0 is HALFLIFE, the terminal program will display the string HALF.

PLC5 RS-232 Cable

com 1

Terminal Emulator

channel 0

AWT

Channel 0 String Location ST9:0 Length 4

Figure 27.6 Serial Output Using Ladder Logic The AWT (Ascii WriTe) function below will write to serial ports on the CPU only.

plc serial -27.9

To write to other serial ports the message function in Figure 27.7 must be used. In this example the message block will become active when A goes true. It will use the message parameters stored in message memory MG9:0. The parameters set indicate that the message is to Write data stored at N7:50, N7:51 and N7:52. This will write the ASCII string ABC to the serial port.

A MSG Control Block MG9:0

Memory Values: Read/Write Data Table Size Local/Remote

setup stored

Remote Station in MG9:0

Link ID Remote Link type Local Node Addr. Processor Type Dest. Addr.

Data Stored in memory N7:50 N7:51 N7:52 Write N7:50 3 Local N/A N/A N/A 20 ASCII N/A

Figure 27.7 Message Function for Serial Communication

27.2.1.1 -ASCII Functions

ASCII functions allow programs to manipulate strings in the memory of the PLC.

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