NOVA electronics MC8022P/MC8042P - 2
1.1 MCX304 Functional Restriction
MC8022P/MC8042P does not support the following MCX304 general output signals. However, it is equipped with
PIX132(NOVA Electronics) on the board, so that it has fourteen general output signals and nOUT general output signals of
MCX304.
MCX304-nOUT1 output signal
nSTOP2/OUT1 pin of MCX304 is used as STOP2 input, so it cannot be used as general output nOUT1.
MCX304-nOUT2, 3 output signals
D15~D8 are used due to 16-bit data bus performance. Therefore, it cannot be used as nOUT2, 3 signals.
1.2 PCI Bus Interface
■ Occupied I/O Address
The board requires 24 I/O address locations for PCI bus. I/O addressing is determined by “plug and play” function of Windows.
■ Data Length
Data length is 16-bit. Read/Write access cannot be performed per byte.
■ Interrupt Signal
When using an interrupt to PCI bus, the board uses IRQ determined by “plug and play” function of Windows.
1.3 Each Axis I/O Interface
■ Drive Pulse Output (nP+P/N, nP-P/N)
Drive pulses in the +/- direction for motor driving are output a 50% duty cycle of from 1PPS to 4MPPS.
Drive pulse output signals of each direction are the differential line-driver output of AM26C31 line driver or equivalent.
■ General Output (OUT1~14, nOUT0)
General output signals (14points) from PIX132, output buffer uses TD62503 (Toshiba) and is the open collector output with
sustaining voltage 35V. These signals are placed in the connector CN4 on the board. nOUT0 signal for each axis can be used as a
deviation counter clear signal (DCC) for a servomotor in automatic home search executing. nOUT0 signal is placed in the rear
connector CN2.
■ Over Run Limit Input (nLMT+, nLMT-)
Input signal to disable output pulse for + and – direction respectively. Decelerating stop and instant stop for active can be
selected in mode setting. These input signals are isolated by photo coupler from internal circuit. external 24V power supply is
needed.
■ Decelerating Stop/Instant Stop Input (nSTOP2~0)
In automatic home search, this input signal is to stop drive pulse in deceleration or immediately from outside. Enable/Disable
and active logical level can be selected in mode setting and each axis has three inputs. For encoder Z-phase signal, input to
nSTOP2. The user can connect to the driver whose type of output circuit is open collector or differential line-driver. These input
signals are isolated by photo coupler from internal circuit.
■ Servo Motor Input (nINPOS, nALARM)
INPOS (in-position) signal and ALARM signal for servo motor drivers can be input, which can also be used as general input
signals. These input signals are isolated by photo coupler from internal circuit.
■ Encoder Input (nECAP/N, nECBP/N)
This signal inputs A/B phase signal from an encoder, which is placed in the connector CN3 on the board. nECAP/N, nECBP/N
signals are for an encoder A/B phase signal input and count up or down 32-bit real position counter inside MCX304. These input
signals are isolated by photo coupler from internal circuit and can easily be connected to a differential output line-driver.
■ Driving by External Input(nEXOP+, nEXOP-)
This signal externally controls driving in the + or – direction, which is placed in the connector CN3 on the board. In fixed
driving mode, the input signal triggers (the falling edge) to output specified drive pulse. In continuous driving mode, drive pulse
is output continuously while the input signal is low. This function can reduce the load of the host CPU, so the user can perform
jog feed of each axis speedy. These input signals are isolated by photo coupler from internal circuit.
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