Control Techniques UD70, User Manual

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UD70
Issue code: 70nu2
Features 8-1
8 Features
This chapter covers the following features of the
UD70
:
•
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
PLC
parameters.
These parameters are identified by a leading underscore ( _) and the letter P,
Q, R and S followed by a number, as follows:
Register Range and type Virtual menu used
for access
_
Px% x = 0 to 99 (32 bit integer with polarity sign) #70.xx
_
Qx% x = 0 to 99 (32 bit integer with polarity sign) #71.xx
_
Rx% x = 0 to 99 (32 bit integer with polarity sign) #72.xx
_
Sx% x = 0 to 99 (32 bit integer with polarity sign) #73.xx
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
RS485
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
UD70
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 // set
_
P1% to 15
_
Q20%.5 = 1 // set bit 5 of
_
Q20% to 1