Delta Data Systems PMAC PCI, Справочник по аппаратуре

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PMAC-PCI Hardware Reference
Mating Connectors 33
Do not connect these outputs directly to the supply voltage, or damage to the PMAC will result from
excessive current draw. The user can provide a high-side voltage (+5 to +24V) into Pin 33 of the JOPTO
connector, and allow this to pull up the outputs by connecting pins 1 and 2 of Jumper E1. Jumper E2
must also connect pins 1 and 2 for a ULN2803A sinking output.
It is possible for these outputs to be sourcing drivers by substituting a UDN2981A IC for the ULN2803A.
This U13 IC is socketed, and so may easily be replaced. For this driver, the internal resistor packs pull-
down instead. With a UDN2981A driver IC, Jumper E1 must connect pins 2 and 3, and Jumper E2 must
connect pins 2 and 3.
The outputs can be individually configured to a different output voltage by removing the internal pull-up
resistor pack RP18 and connecting to each output a separate external pull-up resistor to the desired
voltage level.
Example: Standard configuration using the ULN2803A sinking (open-collector) output IC
Control-Panel Port I/O (JPAN Port)
The J2 (JPAN) connector is a 26-pin connector with dedicated control inputs, dedicated indicator outputs,
a quadrature encoder input, and an analog input. The control inputs are low-true with internal pull-up
resistors. They have predefined functions unless the control-panel-disable I-variable (I2) has been set to
1. If this is the case, they may be used as general-purpose inputs by assigning M-variable to their
corresponding memory-map locations (bits of Y address $FFC0).
Command Inputs
JOG-/, JOG+/, PREJ/ (return to pre-jog position), and HOME/ affect the motor selected by the FDPn/
lines (see below). The ones that affect a coordinate system are STRT/ (run), STEP/, STOP/ (abort), and
HOLD/ (feed hold) affect the coordinate system selected by the FDPn/ lines.
Selector Inputs
The four low-true BCD-coded input lines FDP0/ (LSBit), FDP1/, FDP2/, and FDP3/ (MSBit) form a low-
true BCD-coded nibble that selects the active motor and coordinate system (simultaneously). These are
usually controlled from a single 4-bit motor/coordinate-system selector switch. The motor selected with
these input lines will respond to the motor-specific inputs. It will also have its position following
function turned on (Ix06 is set to 1 automatically); the motor just de-selected has its position following
function turned off (Ix06 is set to 0 automatically).
It is not a good idea to change the selector inputs while holding one of the jog inputs low. Releasing the
jog input will then not stop the previously selected motor. This can lead to a dangerous situation.
Alternate Use
The discrete inputs can be used for parallel-data servo feedback or master position if I2 has been set to 1.
The Acc-39 Handwheel Encoder Interface board provides 8-bit parallel counter data from a quadrature
encoder to these inputs. Refer to the Acc-39 manual and Parallel Position Feedback Conversion under
Setting up a Motor for more details on processing this data.