Basler BE1-CDS220, Instruction Manual

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3-10 Input And Output Functions BE1-CDS220
Figure 3-5. Inputs and Outputs Screen, Inputs 1-4 Tab
If the user desires that the relay reject ac voltage that may become coupled into the contact sensing
circuits, the recognition time can be set to greater than one-half of the power system cycle period to take
advantage of the half-wave rectification provided by the input circuitry.
If the user desires to use an ac wetting voltage, the recognition time can be set to less that one-half of the
power system cycle period and the debounce timer can be set to greater than one-half of the power
system cycle period to ride through the negative half cycle. The default settings of 4 milliseconds
recognition and 16 milliseconds debounce time allow the relay to be used with ac wetting voltage.
Retrieving Input Status Information From The Relay
The status of the inputs can be determined using BESTCOMS Metering screen, the optional HMI using
screen 1.4.1, STAT\OPER\INPUT, and from the ASCII command interface using the RG-STAT (report
general-status) command or RG-INPUT (report general-input status) command. See Section 6, Reporting
and Alarm Functions, General Status Reporting for more information.
OUTPUTS
BE1-CDS220 relays have six general-purpose output contacts (OUT1 through OUT6) and one fail-safe,
normally closed (relay in de-energized state), alarm output contact (OUTA). Each output is isolated and
rated for tripping duty. Relays OUT1 and OUT6 are high speed (one-quarter cycle nominal operating
time). OUT1 through OUT5 are Form A (normally open), OUT6 is Form C (single-pole, double-throw), and
OUTA is Form B (normally closed).
Hardware Outputs and Virtual Outputs
Output contacts OUT1 through OUT6 and OUTA are driven by BESTlogic output expressions VO1
through VO6 and VOA (virtual outputs 1 through 6, and A). Since the use of each output contact is
completely programmable, the user can assign meaningful labels to each output, as well as, to the zero
and one states. See Section 7, BESTlogic Programmable Logic for more information on programming
output expressions in your programmable logic scheme.
A virtual output (VOn) exists only as a logical state inside the relay. A hardware output (OUTn) is a
physical, output relay contact. The state of the output contact can vary from the state of the output logic
expression for three reasons: one, the relay trouble alarm disables all outputs; two, the programmable
hold timer function; and three, the select before operate logic override control function. Figure 3-6 shows
a diagram of the output contact logic for the general-purpose output contacts. Figure 3-7 shows a diagram
of the output contact logic for the fail-safe alarm output contact.