PLC REQUIREMENTS:
i. PLC shall be designed, constructed & tested in accordance with IEC 61131.
ii. PLC shall have self diagnostic feature, to detect failure. When a failure happens it should raise alarm.
iii. Failed modules within the PLC system shall automatically detected, identified and alarmed via output contact(s), diagnostic status words & LEDs without interruption of normal processing functions. On-Line removal/replacement of any PLC system module shall be possible without having reconfigure system software, alter system wiring or cabling, or re-initialize the PLC system.
iv. The PLC shall support PID closed loop control, open loop control, and logic & sequence functions.
v. The PLC shall support Report-By-Exception and Report-All status data.
vi. The PLC shall automatically upload data to the Master station upon receiving a poll request.
vii. The PLC shall support remote configuration, remote down loading, remote uploading of stored data, and remote data base modifications.
viii. The PLC shall be capable of being rebooted via a remote SCADA signal.
ix. The PLC Mean Time between Failures (MTBF) shall not be less than 20,000 hours. This is applicable to the full complement of hardware comprising the PLC.
x. It shall be possible to configure the same PLC to function as: a) Unit PLC Station (slave to a master).
2. CPU:
CPU shall be redundant.
When PLC failure occurs, the discrete outputs shall freeze to its current state or turn off.
3. I/O DETAILS:
Digital ip – 31
Digital op – 7
A failure or fault indication on any I/O module shall initiate a system status alarm.
Discrete outputs that drive solid state inputs, i.e annunciator points, shall be provided with dry relay contacts.
Digital O/P modules shall be 120VAC
4. POWER SUPPLIES:
i. Incoming Power source to the PLC system will be 120VAC
ii. Power fail detection & recovery.
5. COMMUNICATION:
i. Two (2) 10/100 Ethernet communication ports with RJ-45 connector.
ii. Isolation: Ethernet port isolated to 500Vdc
iii. One (1) RS-232 & One(1) RS-485 serial communication port.
iv. The PLC shall be capable of operating in a stand-alone manner, with full functionality, independent of communication with the Master station.
v. In case of a communication failure with the master, the PLC shall be capable of archiving data points. The number of points shall be specified in the PLC Specific Requirement Sheet.
vi. Upon recovery from communication or power failure, the PLC shall be ready to accept automatic download of database changes from the master station and also it shall be ready to respond to a poll request within 30 seconds of re-establishing communication.
6. Environmental Conditions:
Operating Temperature range: 10° to 70°C ,
Relative Humidity:15-95% non-condensing
Please suggest me a PLC .
i. PLC shall be designed, constructed & tested in accordance with IEC 61131.
ii. PLC shall have self diagnostic feature, to detect failure. When a failure happens it should raise alarm.
iii. Failed modules within the PLC system shall automatically detected, identified and alarmed via output contact(s), diagnostic status words & LEDs without interruption of normal processing functions. On-Line removal/replacement of any PLC system module shall be possible without having reconfigure system software, alter system wiring or cabling, or re-initialize the PLC system.
iv. The PLC shall support PID closed loop control, open loop control, and logic & sequence functions.
v. The PLC shall support Report-By-Exception and Report-All status data.
vi. The PLC shall automatically upload data to the Master station upon receiving a poll request.
vii. The PLC shall support remote configuration, remote down loading, remote uploading of stored data, and remote data base modifications.
viii. The PLC shall be capable of being rebooted via a remote SCADA signal.
ix. The PLC Mean Time between Failures (MTBF) shall not be less than 20,000 hours. This is applicable to the full complement of hardware comprising the PLC.
x. It shall be possible to configure the same PLC to function as: a) Unit PLC Station (slave to a master).
2. CPU:
CPU shall be redundant.
When PLC failure occurs, the discrete outputs shall freeze to its current state or turn off.
3. I/O DETAILS:
Digital ip – 31
Digital op – 7
A failure or fault indication on any I/O module shall initiate a system status alarm.
Discrete outputs that drive solid state inputs, i.e annunciator points, shall be provided with dry relay contacts.
Digital O/P modules shall be 120VAC
4. POWER SUPPLIES:
i. Incoming Power source to the PLC system will be 120VAC
ii. Power fail detection & recovery.
5. COMMUNICATION:
i. Two (2) 10/100 Ethernet communication ports with RJ-45 connector.
ii. Isolation: Ethernet port isolated to 500Vdc
iii. One (1) RS-232 & One(1) RS-485 serial communication port.
iv. The PLC shall be capable of operating in a stand-alone manner, with full functionality, independent of communication with the Master station.
v. In case of a communication failure with the master, the PLC shall be capable of archiving data points. The number of points shall be specified in the PLC Specific Requirement Sheet.
vi. Upon recovery from communication or power failure, the PLC shall be ready to accept automatic download of database changes from the master station and also it shall be ready to respond to a poll request within 30 seconds of re-establishing communication.
6. Environmental Conditions:
Operating Temperature range: 10° to 70°C ,
Relative Humidity:15-95% non-condensing
Please suggest me a PLC .