Today, many of manufacturing system integrators are pursuing new business solution on information technology (IT) embedding Internet of Things (IoT) functionalities. However, how about conventional type of system integrators? Although their customers already require new innovative IoT solutions, such integrators tend to still provide traditional operational technology (OT) solutions that the customers are less interested in. This is a cause of lack of knowledge of IT technology that OT engineers have never experienced. This paper introduces a preliminary study for a method development on pragmatic workshop combining with business model definition and IoT technology training for such OT system integrators. This workshop method particularly focuses on convergence of OT and IT; defining a new business value chain and experiencing of commercial IoT technology as hands-on session. This paper is mainly discussed a real case study as a preliminary trial in an industrial city in Far East region.