Features; Plc Parameters - Control Techniques UD70 User Manual

8

Features

This chapter covers the following features of the
• Single-axis position controller
• Timer/counter unit
• Digital I/O ports
• Non-volatile memory storage
8.1

PLC parameters

The UD70 contains a special range of variables known as
These parameters are identified by a leading underscore (
Q, R and S followed by a number, as follows:
Register
_
Px%
_
Qx%
_
Rx%
_
Sx%
Note that the registers can also be accessed using the virtual menus 70 to
73. This gives the ability to alter the P, Q, R and S registers using the
port or any high speed comms option that may be fitted. (CTNet, Interbus
Profibus etc.)
The P and Q registers can be saved in the non-volatile memory of the
by setting #17.19=1 (See Non-volatile memory storage later in this chapter.)
The R and S registers cannot be saved.
The Q registers are reserved for use with the internal position loop when
the loop is enabled.
The P, R and S registers have no reservations on use, and can be used as
general registers. When the CT Net option module is installed, the R and S
registers are used as transmit and receive registers for cyclic data transfer.
If the position loop is disabled (#17.12 = 0), the Q registers may also be used
as general registers.
Examples
_
P1% = 15
_
Q20%.5 = 1
UD70
Issue code: 70nu2
Range and type
x = 0 to 99 (32 bit integer with polarity sign)
x = 0 to 99 (32 bit integer with polarity sign)
x = 0 to 99 (32 bit integer with polarity sign)
x = 0 to 99 (32 bit integer with polarity sign)
_
// set P1% to 15
_
// set bit 5 of Q20% to 1
:
UD70
parameters.
PLC
_) and the letter P,
Virtual menu used
for access
#70.xx
#71.xx
#72.xx
#73.xx
RS485
UD70
Features 8-1