In this paper, we propose an approach to checking consistency of control software requirements described using pattern-based notation. This approach can be used at the beginning of control software verification to effectively identify contradicting and incompatible requirements. In this framework, we use pattern-based Event-Driven Temporal Logic (EDTL) to formalize the requirements. A set of requirements is represented as a set of EDTL-patterns which formal semantics defined by formulas of linear-time temporal logic LTL. Based on this semantics, we define the notion of requirement inconsistency and describe restrictions on the values of pattern attributes which make requirements inconsistent. Checking algorithm takes as an input pairs of requirements and compare their attributes. Its output is sets of consistent, inconsistent and incomparable requirements.