Digital buffer i/o ttl relay driver

The logic circuit and output circuit inside the board are isolated by this relay contact. Also, because there are no limits on the direction the current flows, AC alternating current loads can also be connected. Use this type with AC operating circuits or to directly control strong electrical devices using more than 48 VDC.

Relay used in output circuit. However, because it is susceptible to electrical disturbances, this type is suitable for environments with favorable noise characteristics and when wiring distances can be shortened. Using a program allows the number of inputs and outputs to be changed in 8-point units. Output circuits for digital input and output are categorized into the following types according to application and electrical differences. This type of output is called contact-less output because there is no real contact involved, unlike contact output.

This output circuit is where the output transistor collector becomes the output terminal and the status becomes open. This output is used to send signals to typical weak electrical devices using 12 to 48 VDC. Output circuit where the output transistor collector becomes the output terminal and the status becomes open. In this output circuit, the output transistor emitter becomes the output terminal.

This output is used to send signals to weak electrical devices using 12 to 48 VDC and is the preferred source type in European countries because it offers high safety concerning ground faults. Output circuit where the output transistor emitter becomes the output terminal. With this output circuit, the output transistor collector becomes the output terminal, the status is open, and the input circuit side is pulled up. The internal logic is negative logic of "Low short : 1, High open : 0.

For any of the coil voltage options 5, 12, or 24V , an input control signal from 2. See datasheet for input current requirements. For a similar board without built-on driver circuitry, please click here. Mounting Options These products are available in two different mounting variants. Product numbers ending with -FT have stick-on rubber feet installed on the bottom side, allowing for benchtop use or panel mounting. Also note in the Boolean expressions that a negated output is indicated by a negation bar drawn above the basic output symbol; the negated state is called a not state; thus, a negated Y output is called a not-Y output.

All modern digital logic circuitry assumes the use of the positive logic convention, in which a logic 1 state is high and a logic 0 state is low.

With this point in mind, Figure 4 presents a basic set of two-input positive and negative logic equivalents. Thus, it can be seen that a negative logic AND gate action — in which the output is low only when both inputs are low — is directly available from a positive logic OR gate, and so on.

If you ever need only a few simple buffers, one cheap way to get them is to make them from spare AND or OR elements as shown in Figure 5 or from pairs of normal or Schmitt inverters as shown in Figure 6.

Figure 7 lists basic details of nine popular, non-inverting digital buffer ICs. In CMOS devices, the unused inputs can be tied directly to either supply line, but in TTL devices, it is best for lowest quiescent current consumption to tie all unused inputs high via a common 10K resistor. If the unused buffer is a three-state type, it should if it has independent control be set into its normal mode via its control input.

Dealing now with the individual buffer ICs listed in Figure 7 , Figure 8 shows the functional diagram and truth table, etc. Thus, any unwanted elements should be disabled by tying their C terminals low and their A terminals high, using one of the methods shown in Figure 9.

Any element can be used as a normal buffer by grounding its C terminal Figure 10 , or as a three-state buffer that drives a common bus line by using it as shown in Figure Thus, this IC can be used as a simple Hex buffer by wiring it as shown in Figure 14 with pins 1 and 15 grounded , or as a Hex three-state buffer that is controlled via a single input by wiring it as shown in Figure 15 with pins 1 and 15 shorted together and used as a DISABLE input.

Figure 16 shows the functional diagram of the , which is a standard TTL Hex buffer in which each buffer has an open-collector output that can sink up to 40 mA and can be connected to a supply of up to 30V via an external current-limiting pull-up resistor but the actual IC must use a 5V supply.

Our products often serve as the basis for customer-specific solutions. Just get in touch with us. We are always there for you! Since its foundation in , Dipl. He will also be happy to advise you personally. The TTL connection is done via a 37pin connector. D-SUB socket. A plastic housing with top-hat rail mountings enables mounting in distribution cabinets or at test stations. The channels can be defined in blocks of 8 both as input and output.

Motors can thus be switched off in a timeout case, for example, and connected horns or other alarm transmitters can be switched on.. Unlocking must be done by an additional software command. Each input has a 16 bit counter. This means that up to pulses can be counted. If the maximum counter value is exceeded, the counting process starts again from zero. By means of a software command, the current status of all input counters can be written simultaneously into a separate memory area.

Status changes that occur between the readout cycles are reliably detected by internal flip-flops and can be read out separately by software. In addition, such an event is signalled by a status LED. Resetting is done automatically after the flip-flops have been read out.

A configuration is only necessary if several identical USB products are to be used on the same system. Only in this way can a clear assignment be made by the software. The module number is stored permanently in the product. Up to identical modules can be used on one system. More details about the control and some programming examples can be found in the programming section.

The handle returned by this function is needed to identify the module for all other functions. This function returns the last detected error. This function returns the last detected error of a specific module handle. This function reads the text of the last detected error. This function deletes the last error of a particular module handle , which was registered with DapiGetLastErrorByHandle.

This function specifically opens a module with an Ethernet interface. The parameters IP address, port number and the duration of the timeout can be determined. The handle returned by this function is required to identify the module for all other functions. This command is supported by all modules with Ethernet interface. This command reads the flip-flops of the inputs and resets them. This command can be used to switch outputs selectively to 0 without changing the states of adjacent outputs.

Only the bits with a value of 1 in the data parameter are considered by the command. This function sets a digital output ch to a value data — 0 or 1 for a certain time in ms.