36 Process Image WAGO-I/O-SYSTEM 750750-657 IO-Link MasterManualVersion 1.0.2, valid from FW/HW-Version 02/01Output data:The SIO byte is only applied when the associated process data segment has alength of 0. Otherwise, the value is ignored in the SIO byte.Process data that exceeds 1 bit per port is in the range of the cyclic data (see thefollowing section).6.4 Cyclic Process DataThe following is an example of a Mailbox size of 2 bytes during configuration:The first bytes of the process image are already allocated with the control/statusbyte, the Mailbox bytes and the SIO byte.If the selected internal bus data width is more than the set Mailbox size +control/status and SIO byte, another data storage area is available in addition tousing the SIO byte in which process data is transferred cyclically from attachedIO-Link devices (see the following figure).Four segments can be configured in this area – one segment for each potavailable. The segment size is set based on the requirements of the application orattached devices.The figure shows the following application with a Mailbox set to 2 bytes:• Internal bus data width: 24 bytes• Segment size for port 1: 3 bytes• Segment size for port 2: 2 bytes• Segment size for port 3: 5 bytes• Segment size for port 4: 7 bytes
