CDN36X User Manual
revision 1.30
I/O Produce Size
The
I/O Produce Size
is the size (in bytes) of the I/O Response Message data field that is sent
from the CDN36X to the DeviceNet master.
I/O Response data:
[TX Ack bits 1-8][RX Toggle bits 1-8][RX Data Instance 1] … [RX Data Instance 8]
The first byte contains the
Transmit Acknowledge
bits for all 8
Serial Transmit Object
Instances.
The second byte contains the
Receive Toggle
bits for all 8
Serial Receive Object
Instances.
These two bytes are used by the CDN36X and application program to synchronize the transmit
and receive operations. The remaining bytes are the
Receive Data
attributes for every enabled
Serial Receive Object
Instance. The number of bytes is determined by the
Data Size
configured
for each enabled Instance. For real and integer numbers, the
Data Size
is predefined by the
selected
Data Type
. For Short-String data byte,
the Data Size
attribute is user-defined.
The following equation is used to calculate the CDN36X I/O Produce Size. Only include the
Data Size
for enabled
Serial Receive Object
Instances.
Transmit Acknowledge
Byte
1
Receive Toggle
Byte
1
Serial Receive Object
Instance 1
Data Size
____
Serial Receive Object
Instance 2
Data Size
____
Serial Receive Object
Instance 3
Data Size
____
Serial Receive Object
Instance 4
Data Size
____
Serial Receive Object
Instance 5
Data Size
____
Serial Receive Object
Instance 6
Data Size
____
Serial Receive Object
Instance 7
Data Size
____
+
Serial Receive Object
Instance 8
Data Size
____
I/O Produce Size
____
Once you have the gateway configured for your application, you can also read the
Serial Stream
Object’s I/O Produce Size
attribute to find out the required number of output bytes.
MKS Instruments, Inc.
D.I.P. Products Group
41
