Running third-party devices through the network (sidebar)

一家可证明的公司可以证明JVH Engineering Inc.，Mich Grandville Grandville。，它可以帮助汽车供应商改造注塑机（IMM）。JVH使用一个汽车供应商来改造使用博世REXROTH数字注射控制器和博世REXROTH闭环钳控制器的IMM。这需要与Allen-Bradley SLC 5/05可编程逻辑控制器集成，可编程逻辑控制器与博世设备进行通信。

The DeviceNet network JVH installed allowed the auto supplier to communicate with the Bosch Rexroth closed-loop controllers and download all the setpoints for the process control. The SLC can then trigger the different parts of the process such as starting the machine clamp “close” process. Diagnostic information is also available. Once the cycle is complete, the Bosch Rexroth controllers provide actual data that help determine how well the machine performed.

“要改造IMM，我们使用的是DeviceNet的更多功能，而不是典型的用户，”JAson Cassiday，JVH的项目工程师解释说。“第三方模块有明确的消息传递，所以我们正在逻辑中做邮件。”Cassiday解释说，最困难的障碍是确保消息正确地通信。将第三方器件混合到自动化系统中的结果是废料率降低近90％，而改造的机器在循环时间内更有效。单独节省的周期时间为每年25,000美元。

See the story that goes with this sidebar: Automation Networking: Stable Protocols and Changing Device Language