G3 Series EtherCAT
TM
Technical Manual
15-167
Subject to change without notice
www.asco.com/g3
EtherCAT
TM
Mapping
I/O Sizes
Manifold
Outputs
Outputs are defined as any valve solenoid coil and/or any discrete output point from any output module. The output
size depends upon the physical configuration of the manifold (i.e. module type and how many are used). Please
reference the following pages for a detailed explanation for calculating the output size.
Inputs
Inputs are defined as physical input bits from input modules and status bits (i.e. diagnostic word generated by the
node, status input bits produced by output drivers and SCP status bits). Thus, the input size will include physical input
points, as well as status input bits. Please reference the following pages for a detailed explanation for calculating the
input size.
Valve Side
The size for the “valve side” of the manifold consists of an output bit for each valve solenoid coil driver and an input
bit for the corresponding diagnostic status input bit. This value for the valve side size is 4 bytes of inputs and 4 bytes
of outputs.
Discrete Side
The discrete side of the manifold is defined as all I/O modules connected to the left of the communication node. This
includes physically attached modules as well as any distributed sub-bus modules. I/O sizes for the discrete side are
automatically configured based on the I/O module type installed. However, the user can affect these sizes manually
via settable parameters on the node. The output value consists of physical outputs (i.e. output bit for each output
point). The input value consists of physical inputs (i.e. input bit for each input point) and user settable status input
bits for corresponding physical outputs and SCP status bits.
Total I/O Size
The overall size of the I/O data for the manifold will consist of the valve size plus the discrete I/O size and all enabled
Diagnostic bits. The I/O size can vary greatly, due to the many physical configuration and user settable parameters
combinations. The following worksheet will allow accurate sizing of the I/O data.
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