The USB-TTL-32/64 has 32 or 64 TTL channels and is accessed via a USB 2.0 interface. 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.
- 32/64 TTL-I/O via 37 pin D-SUB female connector
- TTL level from 5V to 1.5V
- USB 2.0 / 1.1
- DIN rail module
TTL I/Os
The product has 32 or 64 TTL I/O channels and supports TTL levels from 1.5V to 5V. The channels can be defined in blocks of 8 both as input and output.
Counter
Each input has a 16 bit counter. This means that up to 65535 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.
Recording of status changes
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.
Fail-safe mode
The fail-safe mode is a safety function in which the DEDITEC module switches to a previously configured, safe switching state in the event of a connection failure.
This is intended to prevent connected installations or systems from continuing to run in an uncontrolled manner.
Three switching states can be defined for each digital output: a) Switched off, b) Switched on or c) Unchanged.
The fail-safe circuit is triggered by a timeout protection function. If the control unit no longer receives any commands from the control PC within a previously defined period of time, the timeout function comes into effect. The cause of a timeout can be a loss of connection between the control PC and the DEDITEC control system or failure of the control PC.
Timeout modes
Three timeout modes are available:
A) “Normal mode” is valid once and must be reactivated manually by software command after each timeout event. The customer application still has access to all controller outputs.
B) In “Auto reactivate mode”, the timeout function is automatically reactivated after communication with the control PC has been re-established. The customer application still has access to all outputs of the control unit.
C) The “Secure outputs mode” blocks access to the outputs after the timeout event. Unlocking can only be carried out by software command. This is an important safety aspect
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