American Audio VELOCITY - REV 4-05 Operations Instructions download pdf (Page 170)

METRO RAIL DESIGN CRITERIA SECTION 9 / SYSTEMS

Appendix A

DE304.09 Appendix 9A-9

Metro Baseline Re-Baseline: 04/20/10

2. Upon receiving a SCADA control word value of “0” the RTU shall take no

action.

3. Upon receiving a SCADA control word value of “1”, the RTU shall set the

control word to a value of “0”, and then activate the associated output relay

for a momentary time period.

4. Upon receiving a SCADA control word value of “2” the RTU shall set the

control word to a value of “0”, and then activate the associated output relay.

5. Upon receiving a SCADA control word value of “4” the RTU shall set the

control word to a value of “0”, and then deactivate the associated output

relay.

6. Receipt of any other SCADA control word value not listed above shall result

in no action.

7. Momentary activation time shall be configurable in ladder logic for each

individual control down to 250 milliseconds. The Contractor shall determine

the value needed for each control output.

G Remote I/O management

1. The typical RTU program shall accommodate one expansion chassis and

up to two remote I/O chassis with a typical configuration as defined in Table

1 - SCADA Memory Map.

2. Adding and enabling remote I/O shall only require the following actions:

a. Install a remote I/O communications module

b. Enable the I/O using the manufacturer provided PLC programming

software to configure the remote I/O module and I/O and enable

memory map transfer as a simple edit to the ladder logic

3. Once enabled, the RTU ladder logic shall monitor the status of the remote

I/O link communications and redundancy and report it in the status register

area of the SCADA memory map.

3.4 SOFTWARE

A The Contractor shall provide a base ladder logic and application programming

necessary to implement the functional requirements of the RTU as described in

these technical provisions.

B The software shall be designed for simple modification to implement site specific

requirements.

C The Contractor shall be responsible for configuration management of the base

software throughout the warranty period and shall make and distribute revisions

to address defects and change orders.

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American Audio VELOCITY - REV 4-05 Operations Instructions Page 170