| Main Features
MLC is a local controller for ripple control installations with a central controller and one or more substations. It provides for emergency operation of the ripple control system after failure of the central station or the communication line between central and substation.The hardware is based on the VME-Bus with a microprocessor system of the Motorola 6800-family and is constructed using rugged 19" rack packaging to insure quality performance. Programming of the MLC is done by means of a PC or Laptop. After programming has been completed, the PC/Laptop can be removed and the MLC controlled via external inputs. In standard configuration, the MLC provides for 8 digital inputs (I1..I8) and 4 digital outputs (O1..O4). The MLC is controlled via these I/O from central with the standard signals Alert and Keying and it generates the control signals for the transmitter, the Checkback signals to central plus one state indication signal. As an option, a switch module with 8 pushbuttons and another 8 digital inputs (I9..I16) are available. This allows for emergency control that doesn't require a PC or Laptop. Modes of operation, functions The local controller MLC is either in REMOTE, LOCAL or HALT mode. In REMOTE mode, the MLC is transparent for signals coming from the central station. Hence these control signals are directly passed on to the ripple control transmitter. The Checkback signal to the central station is generated from the Checkback transmitter. An external input or the PC/Laptop connected allow to switch the MLC to the LOCAL mode. The external input can be activated from the central controller or through the local communication equipment. In LOCAL mode the MLC runs the ripple control system according to a locally stored program. In addition, this mode allows to manually initiate transmissions. All events are stored in a non volatile RAM. These data can be retrieved with a PC or Laptop. In the HALT mode all transmissions are disabled. IT is only possible to change to HALT-mode locally via pushbutton or by means of PC/Laptop |
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Local Controller MLC
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