American Audio VELOCITY - REV 4-05 Betriebsanleitung PDF herunterladen (Seite 166)

METRO RAIL DESIGN CRITERIA SECTION 9 / SYSTEMS

Appendix A

DE304.09 Appendix 9A-5

Metro Baseline Re-Baseline: 04/20/10

3.3 REMOTE TERMINAL UNIT OPERATION

A Power-up and Initialization

1. Turning the RTU on or off shall be accomplished by operating a single

breaker installed on the assembly. Operating this breaker shall control

power to the entire assembly.

2. Upon application of power the RTU shall normally power up, initialize and

achieve a normal operating state without the need for any manual

intervention.

3. The RTU initialization shall clear all system fault registers before initiating

the system diagnostics.

B Diagnostics

1. The RTU shall perform continuous diagnostics to report the following

conditions:

a. CPU faults

b. Module faults

c. Remote I/O link status

d. Local serial link status for communications based subsystem

interfaces

2. The RTU shall increment a health register (RTU Health Register) once per

second to indicate to SCADA that the PLC is in a normal run mode and is

executing the ladder logic. The register shall reset to zero when a value of

255 is reached.

3. The RTU shall monitor a health register that is updated by the SCADA

system (SCADA Communications Watchdog). If the register fails to update

for 30 seconds the RTU shall declare the SCADA system as offline. This

status shall be reflected in the first contact of the first discrete output

module. The contact shall be closed if SCADA is online and shall be open if

SCADA is not online or the PLC is failed.

4. The RTU shall monitor control/wetting voltage in the 1

input point of the

first discrete input module.

5. The RTU shall report a chassis summary blown fuse alarm for each fused

terminal block starting at the 2

input point of the first discrete input

module.

C SCADA Communications

1. The Cable Transmission System (CTS) shall provide an Ethernet LAN

dedicated for SCADA communications. The LAN shall allow all RTU to be

accessed from a single port on the CCF SONET without the need for any

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American Audio VELOCITY - REV 4-05 Betriebsanleitung Seite 166