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Industrial Control Systems (ICS) networks offer a high level of automation combined with high levels of control, quality and process improvement. Since network corporate users have to access the ICS environment, these networks have to be interconnected. However, this interconnection can introduce risks to the systems and manufacturing processes, which leads to the need to ensure the interconnection is done safely. The objective of this paper is to perform modeling and validation of a proposed secure interconnection between ICS and corporate networks using Colored Petri Networks (CPN). In addition to the best practices published in related works, this paper recommends some integrated features like the use of terminal server service, secure manual uplinks, and unidirectional security gateway to enhance environmental security. However, our main contribution is the validation process performed in a Colored Petri Network, which made it possible to execute queries in the state space resulting from the simulation - that works as a proof of concept. As a result, the paper presents a secure and validated model of interconnection between ICS and corporate networks, capable of being applied to any interconnection environment.