Rockwell Automation 1747-DCM,D17476.8 Direct Communication Module - Manual (Page 13)

Preface
P–5
Rack Size – The logical rack size of the DCM image.
RIO Link – (Remote Input/Output) Refers to an Allen–Bradley
communication system supporting high–speed serial transfer of Remote I/O
(RIO) control information.
Scanner – The communication master on the RIO link.
Scanner Image – The data table area within the scanner, used to exchange
I/O information between the scanner and all the adapters on the RIO link.
The scanner image is a portion of the SLC or PLC processor image.
Slave – In a communication link, a station that cannot initiate
communication.
SLC Chassis – A physical SLC (Small Logic Controller) rack that houses
SLC processors and 1746 and 1747 I/O modules.
Slot – The physical location in any chassis used to insert I/O (or specialty)
modules.
Supervisory Control/Controller – A control system whereby a host
(supervisory) controller/processor monitors and intermittently adjusts control
parameters, as necessary, of one or several lower level processors while the
lower level processor(s) performs the control task continuously in real time.
The following conventions are used throughout this manual:
•
Bulleted lists such as this one provide information, not procedural steps.
•
Numbered lists provide sequential steps or hierarchical information.
•
Italic type is used for emphasis.
Common Techniques Used in
this Manual