In Aspen Plus, convergence-related parameters such as MAXIT, TOL, current iteration number, and ERR/TOL are not directly accessible through the DEFINE statement or inline Fortran. This project introduces a practical workaround using Calculator blocks to monitor and count convergence iterations. A parameter variable is initialized outside the convergence loop and incremented within it, allowing users to track the number of iterations indirectly. To ensure consistent execution, a dummy variable linked to a flowsheet parameter is used to trigger the Calculator block evaluation reliably during each convergence attempt.

This approach enables better visibility into iterative solver behavior, particularly for complex or difficult-to-converge systems. It provides a simple yet effective method for diagnosing convergence issues, tuning solver parameters, and enhancing model transparency without relying on native access to internal solver variables. The technique also opens possibilities for advanced control logic or simulation monitoring within Aspen Plus.