Red Lion GEMINI 33 User Manual

Page 35

SENSOR INPUT CONNECTIONS & INPUT CONFIGURATION SWITCH SET-UP

The accompanying diagram shows the details of Input A, Input B, and

Magnetic Pickup circuit. The schematic circuit for Input B is almost identical

to that of Input A, with the exception that Input B does not have the Magnetic

Pickup circuitry paralleled with it. The four switches used to set up Input A

and the Magnetic Pickup are designated S1, S2, S3, and S4. To set up Input B,

use switches S5, S6, and S7. The functions of these switches are as follows:

S1 - MAG: Enables the Magnetic Pickup terminal to be used.

LOGIC: Disables the Magnetic Pickup Input.

Note: SWITCH S2 MUST BE IN THE “SNK” POSITION FOR

MAGNETIC PICKUP OPERATION.

S2 - SNK: Provides a 7.8 K pull-up resistor for sensors with current

sinking outputs.

SRC: Provides a 3.9 K pull-down resistor for sensors with current

sourcing outputs.

S3 - HI FRQ: Removes damping capacitor and allows operation up to the

max. count frequency. Min. count ON or OFF time - 50 usec (U/D

or INH.), 50% Duty Cycle (all other “Inputs A & B Response

Modes”).

LO FRQ: Connects damping capacitor for switch contact

debounce. Limits count speed to 100 cps max. Min. count pulse ON

or OFF time - 5 msec. (See Note 2, Page 31.)

S4 - HI BIAS: Sets input trigger levels at mid-range to accept outputs

from 2-wire proximity sensors, resistive photo-cells, and logic

pulses with full 0 to +12 V swings. (V

= 5.5 V, V

= 7.5 V, See

Note 3, Page 31.)

LO BIAS: Sets input trigger levels to the low range to accept logic

pulses with 0 to 5 V swings. (V

= 1.5 V, V

= 3.75V, See Note 3,

Page 31.)

S5 - Same as S2, for Input B.

S6 - Same as S3, for Input B.

S7 - Same as S4, for Input B.

S8 - DIS. RST.: Disables front panel Reset button, “R”.

EN. RST: Enables front panel Reset button “R”, if “Operator

Accessible Functions” mode (Code 66) has reset enabled.

-33-

CHA

NNE