Appendix A-3: Specification of the I/O Node

The specifications of the I/O node differ between real and virtual controllers. The main differences are as follows:

	Actual controller	Virtual controller
AccessLevel	Input Port: CurrentRead Output Port: CurrentRead	Input Port: CurrentRead,CurrentWrite Output Port: CurrentRead
Address Space	I/O nodes with either bit or byte only	I/O nodes of all data types displayed on Epson RC+ I/O monitor

The I/O nodes in the virtual controller are organized in a hierarchical structure, with nodes with smaller data sizes as child nodes. An example of I/O node’s Address Space is shown below.

ObjectType Description
The virtual controller also supports Word type I/O data.

• Variable[IOWordIdentifier]

  [IOWordIdentifier], like [IOByteIdentifier] and [IOBitIdentifier], indicates that the I/O port includes multiple I/O signals. This Variable node exists for each word of the I/O signal. When the Value is converted into a binary bit string, the port of the number(0~) of the bit that becomes 1 means ON in the I/O signal, and the port of the number of the bit that becomes 0 means OFF in the I/O signal.