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IC693DNM200 steam turbine module

The latching mechanism exists solely to lockout subsequent incoming signals for the time it takes to communicate to the controller that a latching event occurred, receive an acknowledgement, and reset the latch. The latched input module does not affect the users field circuit, drive the controller or communicate information to it other than the fact that a latching event took place. Signals on the 16-channel inputs are compared to a reference voltage nominally set to 75% of the group supply voltage. An input signal of 500 s minimum pulse width and equal to or exceeding the reference voltage threshold will cause a latched ON state for any given channel.An input signal voltage less than 25% of the group supply voltage will result in a system OFF state .When the module senses and latches on the leading edge of the true-high, incoming field signal or data bit (DB), it clocks the D-type flip-flop on the low-to-high transition, in effect, capturing the latching event.

The module’s ON state is communicated

 to the controller through Shift Register (A) and OBS chip via a handshake mechanism. The logic is then returned to the module from the CPU as an inverted signal through shift register (B) where it resets the flipflop (latch condition) for that channel only. The reset latch is then available for another, low-to-high, event transition. To ensure that the controller has received a latched event, the module actually operates in a user programmed, echoed- data handshake mode. The handshake mechanism requires four to six scans before a new event can be recognized. Total scan time is software-limited to 200 ms maximum and hardware limited to 250 ms maximum.Thus, you should not attempt to record events with a repetition rate greater than one per second unless willing to analyze this actual system and program. Note: Reversal of external load polarity will not cause circuit failure as the module is fused to protect its circuitry against overload currents and accidental polarity reversal.

B881–508 125 Vdc Output, Overview 

The B881–508 125 Vdc Output Module has eight isolated outputs. The outputs can serve 125 Vdc voltage relays, pilot lamps, motor starters, solenoids, valves, and any other load rated up to 140 Vdc (the outputs work in the range 5—140 Vdc). Also, the B881 allows current surges within certain time limits. Internal fault flags report currents greater than 30 A, and currents between 5—30 A for a period greater than 500 ms. This shut down mode can only be cleared by resetting the point. Point control within ms provides fast response in critical situations. The B881–508 conforms to ANSI/IEEEC37.90 1978 duty cycle sequences. In addition to the normal mode of controlling the outputs, the B881–508 allows the first four points to be independently controlled by external inputs through the field side connector. These external inputs are 24 Vdc active high. When a fault occurs during control by the external inputs, that input must be cycled (turned off) to clear the fault flag. The following illustration is the B881–508 simplified schematic diagram