American Audio VELOCITY - REV 4-05 Betriebsanleitung PDF herunterladen (Seite 174)

METRO RAIL DESIGN CRITERIA SECTION 9 / SYSTEMS

Appendix A

DE304.09 Appendix 9A-13

Metro Baseline Re-Baseline: 04/20/10

G RTU Discrete Input Modules

1. The RTU’s contact input interface shall be capable of accepting isolated

Form C contact inputs and be capable of interfacing to open collector

inputs.

2. Filtering to limit effects of transients and contact bounce.

3. Optical isolation to shield logic circuits from possible damage due to

transients.

4. LED indicator for each input point status.

5. Each module shall have 32 inputs.

6. The operating voltage range shall be at minimum 21-26 voltage DC.

7. Delay on-to-off and off-to-on time shall be 8ms.

8. Input impendence shall be at least 5KOhm.

H RTU Discrete Output Modules

1. RTU discrete output modules shall identical across the system. Interposing

relays shall be utilized where necessary to satisfy specific isolation and

interfacing requirements.

2. Each module shall have 32 outputs.

3. Optical isolation shall separate module logic from field power.

4. The maximum off-to-on and on-to-off delay shall be 10ms.

I RTU Analog Input Modules

1. Each module shall support at least 8 differential or single ended inputs.

2. Inputs shall be user selectable to allow voltage or current signals, Voltage:

± 10V dc, 0 to 10V dc, 0 to 5V dc, 1 to 5V dc, Current: 0 to 20 mA, 4 to 20

mA.

3. Full scale analog ranges: Voltage: ± 10.5V dc, 0 to 10.5V dc, 0 to 5.25V dc,

0.5 to 5.25V dc; Current: 0 to 21 mA, 3.2 to 21 mA

4. Drift Voltage Terminal: ±0.003% per °C, Current Terminal: ±0.0045% per

°C.

5. Current loop impedance <= 250 ohms.

6. Voltage input impedance >= 220KOhm.

7. User configurable input filtering for desired noise suppression or signal

response time.

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American Audio VELOCITY - REV 4-05 Betriebsanleitung Seite 174