What Is the Main Difference Between 1734-IB8S Series A & B? Ser B can use up to 110 mA of electricity while Ser A can use up to 175 mA. The maximum power indulgence for Sers B and A is 3.0 W and 3.4 W, respectively. The PLC's I/O configuration may easily be expanded by adding peripheral modules using RSLogix & Studio 5000. Asteam Techno Solutions Pvt Ltd is familiar in the industry of Automation Parts Supplier. You can buy industrial automation parts here; we have high-quality products with unbeatable customer service.