ABB Advant Controller 80, User Manual

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4-36 AC 80 User’s Manual
DB Elements Each node (I/O device) on the Special I/O link is activated with the DB
element NCBIO1. For each node, NCBIO1 defines a buffer containing
the records that are used by the link to transmit and receive cyclic
messages.
The NCBIO1 element has to be defined in the application prior to any
Special I/O link PC element.
Figure 4-33 The NCBI01 DB element.
The type of the Special I/O device is defined by NCBIO1 terminal
IOTYPEx (where x = 1 to 8). Note that the first terminal is assigned to
Node 1, the second terminal to Node 2 etc.
The following I/O device types are supported:
PC Elements The IORX (Input Output Receive) element is used for sending and
receiving datasets. IORX can create different types of cyclic messages
supported by the DDCS protocol used in the Special I/O link. The
destinations of the transmitted data are selected by the signal index.
The source of the received data is selected via element input
parameters. These parameters specify the node number and signal
index (dataset number). See the
AC 80 PC Elements Reference
Manual.
Each I/O device can have one up to eight IORX elements in the
application program, i.e. the maximum number of IORX elements is 64.
Module Type NCBI01 IOTYPE
NBIO-31 DI/DO_DEVICE
NBIO-21 AI/AO_DEVICE
NPCT-01 COUNTER_DEVICE
NDSC-01 DSU DEVICE