Real Time Automation, Inc.
20
1-800-249-1612
Setting up PLC to ASCII Communication
Click the
ASCII Configuration
button under the
CONFIGURATION
section.
Define PLC Tag / File
1)
Data Type: Select the Data Type for the Tag / File Name that you defined in the PLC.
a.
If PLC Type configured is I/O Scanner, then this field is not used.
2)
Enter the Tag / File name that you want the gateway to monitor for messages.
a.
The Tag / File must be defined in the PLC and must match exactly.
b.
Most of the time, the Tag Name is defined within the Controller Scope of the PLC for
Read/Write Access.
i.
To configure our gateway for a Program Scope Tag, see
instructions.
c.
If PLC Type configured is I/O Scanner, then this field is not used.
3)
Character Count: Enter the maximum number of characters that the gateway can send to the
ASCII device.
a.
If using an INT Data Type, this is also the dimension size/2 + 1 of the Tag / File.
b.
If using a SINT Data Type, this is also the dimension size + 2 of the Tag / File
c.
For Controllers using RSLogix5000, the range for each data type is:
i.
STRING/INT/SINT: 1-4096 characters.
ii.
STRING
–
If using more than 82 characters, a User Defined Data Type must be
created within the PLC and used. Refer to
for instructions.
d.
For Controllers using RSLogix500, the range for each data type is:
i.
STRING: 1-82 characters