ZS16

Descripción del producto

ZS*6 Micro telecontrol system
 
In large water treatment or industrial plants, railway depots and in building technologies it is often necessary to transmit only a few messages and commands by saving wires using the existing cable networks. In these cable networks power lines often run in parallel or control lines at different voltage levels in the same cable. The basis variant of the bi-directional serial transmission system ZS*6 is developed to transmit 8 messages or commands and consists of 2 ZS ***8M master modules with 8 digital s/outputs each. Using the expansion module ZS ***8E/A and installing a ribbon cable leads to the expansion of the system up to *6 messages. Additionally it is also possible to transmit 4 measured values each in the ranges of 0… *0 V and 2 … *0 mA with the analogue or output module either in one or both directions. Moreover the degree of the configuration of the system is to be set by DIP-switches. Each module of the ZS*6 has a plastic housing and can be mounted on DIN rails. Red LEDs on the front panel indicate the status of the messages and a green LED monitors the *-wire traffic. In the case of a wire break or short circuit this display goes out and the permanently pulled on error signaling relay drops off. To control lamps, solenoid valves as well as contactors directly the outputs are provided with 8 short circuit proof PNP transistors with free-wheeling diodes.
In order to achieve a high degree of transmission reliability, each data message is secured using a *2 bit CRC code in accordance with ANSI X3.*6 protocol. When a transmission disturbance occurs, the outputs will be restored to their intrinsically safe state, which can be defined using the DIP switch accessible on the underside. The digital circuits are electrically isolated from the supply voltage and the two-wire circuit. By this the formation of possible leakage current loops is prevented. The connections for the supply voltage, s and two-wire are protected against polarity reversal.
 
When using the ZS*6 no special signal cables are needed. In the event of severe interference impact on the two-wire line the connection with a resistor in parallel to the two-wire can achieve an effective rejection. For this each delivery also includes resistors. The data transmission rate can be set by means of a DIP switch. To transmit a signal securely it has to be kept switched on for the duration of the transmission cycle.