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CTI 2500 Installation and Operation Guide V2.8
103
APPENDIX D. – COMPATIBILITY
Overview
The CTI 2500 controller is designed to be compatible with customer applications that use the
Siemens SIMATIC
®
545 and 555 controllers. While the CTI 2500 matches or exceeds the
capabilities of these processors in most aspects, there are a few areas in which the CTI 2500
operates differently.
Relay Ladder Logic
The RLL used in the controller provides equivalent instructions for all SIMATIC
®
555 instructions
except the XSUB instruction. External subroutines are not supported. If you download a
program containing the XSUB instruction, it will be ignored.
Special Function Programs
The controller compiles SF programs and subroutines in the following situations:
•
When a user program is downloaded to the PLC, if the SF program or subroutine is enabled,
•
When the SF program or subroutine is enabled, if the SF program has been modified,
•
During a Power Up start (following the application of power),
•
When using Partial or Complete Restart to recover from a compiled checksum error.
Programs that contain errors will not be enabled. During a program download, Workshop will
display a message indicating the error. Once you acknowledge the message, the download will
continue, leaving the program disabled. You must correct the programming error before the
program or subroutine can be enabled.
NOTE
User Programs originally written for the SIMATIC
®
505 PLC that we not compiled may contain undetected
errors. This can occur because the SF interpreter may never attempt to execute the instruction due to the
branching logic. A common problem is that additional ENDIF statements are included or the correct
number of ENDIF statements is not present.
YOU WILL NEED TO IDENTIFY AND CORRECT ANY LOGIC ERRORS BEFORE THE SFP OR SFS
WILL EXECUTE.
Starting with firmware Version 4.00, the CTI 2500 controller supports all SIMATIC
®
555 Special
Function instructions.
Содержание 2500-C100
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