PMAC Product Guide J8 (JEQU): Position-Compare Connector TB1 (JPWR): Power Supply Note: Use an external power supply that will keep the digital and analog circuits separate and that will provide better electrical noise isolation to PMAC. To keep the optical isolation between the digital and analog circuits on PMAC, provide analog power (+/-12V to +/-15V & AGND) through the JMACH connector instead of the bus connector or this terminal block. Machine Connections 41 J8 JEQU (10-Pin Connector) Front View Pin # Symbol Function Description Notes 1 EQU1/ OUTPUT Enc. 1 Comp-Eq Low is true 2 EQU2/ OUTPUT Enc. 2 Comp-Eq Low is true 3 EQU3/ OUTPUT Enc. 3 Comp-Eq Low is true 4 EQU4/ OUTPUT Enc.
4 Comp-Eq Low is true 5 AENA1/ OUTPUT Amp Enable 1 Low is true 6 AENA2/ OUTPUT Amp Enable 2 Low is true 7 AENA3/ OUTPUT Amp Enable 3 Low is true 8 AENA4/ OUTPUT Amp Enable 4 Low is true 9 A+V SUPPLY Positive Supply +5V to +24V 10 AGND COMMON Analog Ground This connector provides the position-compare outputs and the amplifier enable outputs for the four servo interface channels. The board is shipped by default with a chip in U54 of type ULN2803A or equivalent open-collector driver IC. It may be replaced with UDN2891A or equivalent open-emitter driver (E101 and E102 must be changed), or a 74ACT563 or equivalent 5V CMOS driver.
TB1 (4-Pin Terminal Block) Top View Pin# Symbol Function Description Notes 1 GND COMMON Reference Voltage 2 +5V INPUT Positive Supply Voltage Supplies all PMAC digital circuits 3 +12V INPUT Positive Supply Voltage Ref to digital GND 4 -12V INPUT Negative Supply Voltage Ref to digital GND This terminal block can be used to provide the input for the power supply for the circuits on the PMAC board when it is not in a bus configuration. When the PMAC-Lite is in a bus configuration, these supplies come through the bus connector from the bus power supply automatically. In this case, this terminal block should not be used.
Symbol Function Description GND COMMON Reference Voltage +5V INPUT Positive Supply Voltage +12V INPUT Positive Supply Voltage -12V INPUT Negative Supply Voltage