JLA

Thanks. You are probably correct that the CLC instruction was left behind. I appreciate your help.

Thank you in advance for your help. I'm new to the Omron CX-Programmer. I'm reading over some ladder logic someone else wrote and trying to understand what is going on. I came across several rungs having the CLC(041) instruction used with the MOVL(498) instruction. I don't understand its usage and in the Omron instructions manual, I don't see any reference to using the CLC(041) flag with the MOVL(498) instruction. Maybe someone will help me understand the design intent. 

CLC(041) is used 3x all with a MOVL(498)?

Thank you for helping me. I searched for a those instruction and did not find them anywhere in the program. I have been through this program pretty comprehensively and don't remember seeing them either.

I have a piece of equipment using a Mitsubishi FX1S. I'm trying to understand the flow of the existing program written by other with no labels. I am specifically interested in understanding the STL instructions and associated S coils. I'm looking for some resources that would help me better understand how all this works. I have been reading the FX series programming manual. Is there something better with examples perhaps? Also, I noticed when I go to simulate mode in GX Works 2 there is a section highlighted in yellow. What does this mean? Thank you for your help.