Specifications

Glossary
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Profibus DP Profibus Decentralized Peripheral. An open bus system that uses an electrical
network based on a shielded 2-wire line or an optical network based on a fiber-optic
cable. DP transmission allows for high-speed, cyclic exchange of data between the
controller CPU and the distributed I/O devices.
reflex action A simple, logical command function configured locally on an Island bus I/O module.
Reflex actions are executed by Island bus modules on data from various Island
locations, like input and output modules or the NIM. Examples of reflex actions
include compare and copy operations.
repeater An interconnection device that extends the permissible length of a bus.
reverse polarity
protection
Use of a diode in a circuit to protect against damage and unintended operation in the
event that the polarity of the applied power is accidentally reversed.
rms root mean square. The effective value of an alternating current, corresponding to the
DC value that produces the same heating effect. The rms value is computed as the
square root of the average of the squares of the instantaneous amplitude for 1
complete cycle. For a sine wave, the rms value is 0.707 times the peak value.
role name A customer-driven, unique logical personal identifier for an Ethernet NIM. A role
name (or device name) is created when you:
z combine the numeric rotary switch setting with the NIM (for example,
STBNIP2212_010), or . . .
z edit the Device Name setting in the NIM's embedded web server pages
After the NIM is configured with a valid role name, the DHCP server uses it to identify
the island at power up.
RTD resistive temperature detect. An RTD device is a temperature transducer composed
of conductive wire elements typically made of platinum, nickel, copper, or nickel-
iron. An RTD device provides a variable resistance across a specified temperature
range.
RTP run-time parameters. RTP lets you monitor and modify selected I/O parameters and
Island bus status registers of the NIM while the Advantys STB Island is running. The
RTP feature uses 5 reserved output words in the NIM’s process image (the RTP
request block) to send requests, and 4 reserved input words in the NIM’s process
image (the RTP response block) to receive responses. Available only in standard
NIMs running firmware version 2.0 or higher.
Rx reception. For example, in a CAN-based network, a PDO is described as an RxPDO
of the device that receives it.
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