United Security Products AVD-45c Manuel Page 202

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188 UDC 6300 Process Controller Product Manual 1/03
5.16 Logic Gate Operation, Continued
Rules and regulations
The output of the Logic Gates are subject to the configuration constraints
and dynamic operational status of the UDC 6300 as listed in Table 5-30.
Table 5-30 Logic Gates Constraints and Dynamic Operation Status
UDC6300 Rules and Regulations
Alarms
Alarms take precedent over gate outputs. No gate
output will occur if the output is directed to Digital
Output 1 or Digital Output 2 and the corresponding
Alarm 1, Alarm 2, Digital Input 3 - Alarm 3, Digital Input 4
- Alarm 4 is also configured.
Output Algorithms
Certain output algorithms take precedence over gate
outputs. No gate output will occur if the output is
directed to Digital Output 3 or Digital Output 4 and a
conflicting output algorithm is also configured
(for example: Time Simplex, Time Duplex, etc.).
External Switch
Some External Switch configurations take precedence
over gate outputs. No gate output will occur when the
following conditions exist:
• Gate output directed to Digital Output 3 or 4 and an
active
external switch is configured for “OUT 3 ON” or
“OUT 4 ON” respectively.
• Gate Output directed to Manual/Auto mode and an
active
external switch is configured for “TO MAN” or “TO
MANFSAFE”.
• Gate Output directed to Local/Remote Setpoint and an
active
external switch is configured for “ToRSP”.
Gate Output will resume when the switch becomes
inactive.
Communications
Communications takes priority over gate output as
follows:
• No Gate Output will occur if directed to Manual/Auto
and the Host computer places the unit (loop) into Manual
or Automatic mode.
• No Gate Output will occur if directed to Local/Remote
and the Host computer selects either Local or Remote
setpoint.
Gate output will resume when the Host computer puts
the unit (loop) into the monitor state or the unit sheds
from the Host.
Mode or Setpoint
If a Logic Gate output is configured for Manual/Auto or
Local/Remote Setpoint, use of the MAN AUTO
key
or RSP/CAS
keys respectively will result in a key
error. However, the MAN AUTO
key is permitted
during communications when the Host computer has
mode control.
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