Specifications

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SPECIFICATIONS (CONTINUED)
c. Passwords and User Levels - The touchscreen shall have 9999 passwords and 99 different Users’
Levels. Harris County shall have an administration password that enables Harris County the
ability to alter passwords and password levels. The administration password shall be able to be
changed by Harris County. The user levels allow or not allow operators certain abilities on the
control station. Some of these abilities are describe in this specification others will be determined
during the initial software meetings with Harris County/Harris County. The touchscreen software
shall allow for changes to the user password and then automatically sync to the rest of the system
including the system logger. Systems that require a Windows domain server to manage users will
not be accepted.
d. Touchscreen Integration: The touchscreen is only an operator interface to the system. No control
logic is allowed on/in the touchscreen computer. All control logic is to reside and be performed
in the PLC. Touchscreen stations and graphic control panels must be able to control the same
points and be able to be integrated into the same control system.
e. All system functions currently incorporated into the system must be retained in the system after
upgrades in addition to those listed in this specification. See section Advanced Software Features
for additional functions required for this system.
f. Touchscreen Control Station Security:
All touchscreen control stations are to be enclosed to prevent tampering using a computer
security enclosure that is lockable. This prevents non-key holders from tampering and port
access on all touchscreen control stations.
Basic Software Feature Set
1. Door Control - Door control logic shall live in and be authorized by the PLC not the human-machine
interface (HMI). The icons shall be on the HMI but the HMI programming has to refer to the PLC
for decision and actions. The HMI only acts as a “window” into the PLC for door control. This is for
security and reliability purposes. Door control shall also be integrated with the touchscreen stations
to operate in the following manner.
a. Unlock - During an Unlock function, all doors shall be configured to automatically relock after a
programmable amount of time. All swinging doors will automatically perform in this manner
during an Unlock function. All overhead doors (basement entrance and exit ramp) shall also be
configured to automatically close after a programmable amount of time if so desired by Harris
County. These programmable times are dynamically adjustable on the fly by Harris County.
b. Hold Open - During a Hold Open door function, all swinging doors, regardless of the type of
locking hardware, will remain unlocked until commanded to lock. Provide a flashing orange
outline around candidate doors. Once selected to the Hold Open mode, the flashing orange
outline will show steady indicating that door is in Hold Open mode. Only solenoid type locks are
allowed to be continually powered for the Hold Open function. All full cycle locks with
mechanical latchback features will first be provided with a momentary pulse long enough to
unlock the door and latch it into the mechanical latchback position; then when the door is opened
and then closed, the PLC will sense when the door re-secures and then will unlock it again. The
PLC shall be programmed to interface to any lock in order to satisfy the Hold Open function as
described.
c. Overhead Door Open - When opening an overhead door, the PLC, through interposing
mechanical relays, will energize the relay to power the door open until it senses the open limit