Mesa 7i48 User Manual

7I48 MANUAL

Six channel analog servo amp interface

V1.6

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Table of Contents

GENERAL . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 1

DESCRIPTION . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 1

HARDWARE CONFIGURATION . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 2

DEFAULT JUMPER LOCATIONS . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 2

TTL/RS-422 ENCODER SELECTION . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 2

CABLE POWER/P1 POWER SELECTION . . . . . . . . . . . . . . . . . . . . . . . . . . . 2

CONNECTORS . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 3

CONNECTOR LOCATIONS AND DEFAULT JUMPERS . . . . . . . . . . . . . . . . . 3

CONTROLLER CONNECTOR . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 4

AUX 5V POWER . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 4

SERVO AMP/ENCODER CONNECTORS . . . . . . . . . . . . . . . . . . . . . . . . . . . . 5

OPERATION . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 8

PWM RATE . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 8

STEP RESPONSE . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 8

ENCODER INPUT CIRCUIT . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 8

MAXIMUM COUNT RATE . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 8

5V POWER . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 9

ENABLE INPUTS . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 9

ENABLE OUTPUTS . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 9

ANALOG OUTPUTS . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 9

SPECIFICATIONS . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 10

DRAWINGS . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 11

7I48 1

GENERAL

DESCRIPTION

The 7I48 is a 6 axis analog servo interfaces intended for operation with MESA’s
Anything I/O cards when used for motion control applications. The 7I48 uses encoder
multiplexing to allow a single Anything-I/O connector to support a six axis interface.

The 7I48 takes up/down PWM or PDM signals from the Anything I/O card and
converts them to +- 10V analog output voltages for direct connection to analog input servo
amplifiers. The 7I48 models also conditions and multiplexes the encoder input signals with
input buffers for TTL inputs a RS-422 receivers for differential encoder inputs.

The controller connection is a 50 pin header that matches the pinout of the Mesa
anything I/O series of cards. The 7I48 uses Phoenix compatible 3.5 mm headers and is
supplied with pluggable terminal blocks.

7I48 2

HARDWARE CONFIGURATION

GENERAL

Hardware setup jumper positions assume that the 7I48 card is oriented in an upright
position, that is, with the 50 pin controller connector is on the left hand side,

DEFAULT CONFIGURATION

JUMPER FUNCTION DEFAULT SETTING

W1 CABLE POWER SELECT RIGHT = CABLE POWER

W13,W16,W19 CH0 TTL/RS-422 SELECT LEFT = TTL

W4,W7,W10 CH1 TTL/RS-422 SELECT LEFT = TTL

W12,W15,W18 CH2 TTL/RS-422 SELECT LEFT = TTL

W3,W6,W9 CH3 TTL/RS-422 SELECT LEFT = TTL

W11,W14,W17 CH4 TTL/RS-422 SELECT LEFT = TTL

W2,W5,W8 CH5 TTL/RS-422 SELECT LEFT = TTL

TTL/RS-422 ENCODER SELECTION

Each 7I48 channel has a selectable TTL or RS-422 (differential) encoder input
conditioning. Conditioning type is determined by setting groups of 3 jumpers to the left or
right position. When the jumpers are in the "LEFT" position, TTL inputs are selected, When
the jumpers are in the "RIGHT" position, RS-422 inputs are selected. Note these sets of
three jumpers are in physical proximity to the terminal block encoder connections.

CABLE POWER/P1 POWER SELECTION

The 7I48 can get its operating power from the flat FPGA cable or from P1. For
testing and with very low power encoders, cable power can be used. W1 selects whether
cable power connects to the 7I48s 5V supply. If W1 is in the "RIGHT" position, cable
power is selected. If W1 is in the "LEFT" position, external 5V power must be supplied via
P1.