INTRODUCTION
UMAC’s Accessory 36E (Acc-36E) is an analog data acquisition board capable of converting 16 analog input signals. The basic Acc-36E board is populated for 16 channels of analog input. The Analog-to Digital Converter (ADC) units used in Acc-36E are the MAX180 monolithic devices manufactured by Maxim Integrated Products. These devices have 12-bit resolution with ± 1/2 LSB linearity specification. For more details on the ADC chips, refer to the data sheet published by the manufacturer:
The Acc-36E’s design features make it an ideal analog data acquisition board for monitoring and collecting signals from a variety of sensors and transducers. By using simple M-variable assignments, the
converted data may be used in PLC programs for monitoring and data collection purposes.
The A/D converter chips used on this accessory multiplex the data, and therefore PMAC must address each channel to read them. Delta Tau has created automatic data transfers for both the 3U Turbo PMAC and the MACRO Station. This automatic method reads addresses for each channel and places the converted data automatically in memory locations accessible by the user.
For UMAC Turbo Firmware 1.936 and above, 16 channels may be read to specified UMAC memory locations automatically. These registers can be monitored using M-Variables or read into UMAC’s encoder conversion table for servo feedback control.
ACC-36E HARDWARE DESCRIPTION
Connectors
Refer to the layout diagram in this section for the location of the connectors on the board.
P1
This connector is used for interface to UMAC’s processor bus via the backplane of the 3U rack. The signals that are brought in through this connector are buffered on board.
J1-J4
Through these connectors, the analog signals are brought into Acc-36E. In addition, the +/- 12 to 15V power supplies are brought out. These power supplies may be used in situations where a separate supply unit is not available for the analog transducers.
P3
Note: The two fuses limit the current drawn to 0.5A on each supply line.
Caution: Do not use this connector.
This is a 20-pin header that is used for factory calibration.
TB1
This is a 4-pin terminal block, which provides the connection for power supply inputs to Acc-36E when it is used in a standalone configuration. Do not use this connector when the card is sitting on the 3U rack.
