26 Introduction and Technical Data
3.4.2.1 Encoder inputs
Note. DIP3 (T 16, B train or sign) and DIP4 (T1 7, A train) are designed to accept bi-directional encoder pulse
trains. DIP2 (T15) is designed to accept a M ARKER for spindle orientation. The encoder outputs must be able
to provide a logic low belo w 2V, a logic high above 4 V, may range up to 50 V max and up to 100KHz. These
2 inputs are single ended and non-isolated. For other types of encoder output, the user must provide some
external conditioning circuitry. The output format may be pulse only for single direction, pulse with sign, or
phase quadrature. See 6.1.10 C ALIBRA TION / ENC ODER SC ALING.
Note. The UIPs offer muc h higher noise immunity for 24V logi c signals.
3.4.2.2 Digital outputs
When the digital outputs are shorted the 24V output will continue to operate with a current capability of
50m A. This is so that the CSTOP line does not go low and shut dow n the drive. If it is important that the
drive continues running with a shorted digital output then a digital output set permanently high may be used
as an auxiliary 24 V po w er output for other tasks, allowing the main 24 V output to be devoted entirely to the
CSTOP function.
The current capability of the digital outputs is also an important issue. Typically 50m A is a sufficient
specification. Ho wever occasionally higher output current is required. The PL/X series addresses this by
allowing a total current limit to be made available to all the digital outputs, allo wing the user to exploit it as
desired. For all 7 outputs together there is a maximum allowable limit of 350m A. Any one output is allowed
to output up to 350m A. Any spare capacity within this limit is also available to the 24V output, which also
has its ow n 50mA capability, giving a maximum total to the + 24V output of 400mA if no digital output is
being used.
This shows the output configuration for each digital output DOP1 to DOP3 and DIO 1 to DIO 4
The digital outputs are also designed to be OR,d together, or with outputs from other drives if desired. This is
sometimes useful if an external event must wait for several outputs to go low. Each output is fitted with a
fly wheel diode to allow the safe driving of inductive loads, and because of the current limiting it is possible to
drive lamps that may have a lo w cold resistance.
3.4.3 Analogue inputs
UIP2 to UIP9
The analogue inputs are required to accurately measure + /-10 V signals. The resolution (minimum
recognisable steps) must be as small as possible and the conversion to a number must be as fast as possible
to give good response times. The PL/X series not only possesses 8 analogue inputs, but also measures all of
these with up to 5mV plus sign resolution and with excellent response time. In addition it is possible to
programme the voltage range of each input to + /- 5, 10, 20 or 30V. This allows signals other than 10V full
scale to be used, and enables the input to be used as a sophisticated digital input. This can be achieved by
programming the input to the 30V range and setting the programmable threshold detector at 15 V to
recognise a 0 or 1. All the analogue input voltages can be monitored using the built in menus, w hich will
display in the selected ranges of + /- 5.120 V, + /-1 0.240V, + /-20.4 80 V and + /-30.720 Volts.
See 6.7.7.7 SPEED PI A D APTION / Using small speed inputs. The default gives lo w gain for small inputs.
Note. When used as digital inputs the UIPs provide exc ellent noise immunity and settable threshold.
Output terminal
Fly wheel
diode
Internal current limited (350m A) + 24V
0V terminal
External load.
E.g. relay coil
All digital outputs
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