American Audio VELOCITY - REV 4-05 Betriebsanleitung Seite 185

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METRO RAIL DESIGN CRITERIA SECTION 9 / SYSTEMS
Appendix B
DE304.09 Appendix 9B-2 Revision 1 : 05/09/12
Metro Baseline Re-Baseline: 04/20/10
Interposing control relays shall include a commutating diode placed directly across the relay coil
to extend the life of the SCADA control contacts. Relay modules with integrated commutating
diode are preferred.
1.4 Serial Interfaces
Unless otherwise specified or approved by Metro, all serial controls shall emulate control circuits
seal-in (set) relays and reset relays.
Use of unpublished or proprietary protocols shall be prohibited.
Serial protocols shall be reliable conforming to the following requirements:
Utilize error detection algorithms to prevent corrupt data from updating control or
indication status.
Implement polling, handshaking or session management to ensure the maintenance of
accurate control and indication information under normal communications conditions.
Implement link status monitoring and reporting.
Report control and indication status changes within one second.
1.5 SCADA Communications
SCADA communications protocol shall be compatible with the existing Metro SCADA systems
and be approved by Metro.
1.6 Typical Controls and Indications
The following sections describe the general requirements for SCADA indication and control.
Additional control and indications shall be determined during design review based on the actual
wayside equipment to be provided.
1.6.1 General
The SCADA interface shall include all control, status, trouble, alarm, lockout and control mode
indications necessary for the safe, effective and efficient remote supervision and control of train
operations, traction power and facilities.
Indications for each individual equipment and function shall be provided except if otherwise
specified.
A SCADA Points Database shall be formally submitted (CDRL) to Metro as part of the Approved
For Construction and AS-BUILT communications design package. A working set SCADA Points
Database shall be provided to Metro as necessary to reflect the current working installation.
The SCADA Points Database shall contain the following information in a single EXCEL
worksheet for every point in the SCADA interface:
Point ID – The point ID shall be a unique alphanumeric identifier assigned by the
designer. The Point ID shall remain fixed in every version of SCADA Points Database.
There are no specific requirements for encoding of the identifier.
Point description – Meaningful, functional description for the point. Identification of
physical devices shall be consistent with the associated drawings including but not
limited to Station Plans, Train Control, Traction Power, Overhead Contact System, and
Facilities systems.
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