AH500 Module Manual 18. Click “Parameters” item on the left-side window and then set the slave parameters as shown on the following three interfaces. Pick “Common” in the following box marked in red and then double click “Hold I/O data” in order to set the handling of receiving the master data after AH10PFBS-5A is offline. 12-34 Name Setting Explanation Loss comm with master Hold I/O data After AH10PFBS-5A is disconnected from the master, the data that the slave receives from the master will remain the same as they were before disconnection. Clear I/O data After AH10PFBS-5A is disconnected from the master, the data that the slave receives from the master will be cleared to 0.