SENSOR INPUT CONNECTIONS & INPUT CONFIGURATION SWITCH SET-UP
The accompanying diagram shows the details of Input 1, Input 2, and
Magnetic Pickup circuit. The schematic circuit for Input 2 is almost identical to
that of Input 1, with the exception that Input 2 does not have the Magnetic Pickup
circuitry paralleled with it. The four switches used to set up Input 1 and the
Magnetic Pickup are designated S1, S2, S3, and S4. To set up Input 2, 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 42.)
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
IL
= 5.5V, V
IH
= 7.5 V, See Note 3, Page 42.)
LO BIAS: Sets input trigger levels to the low range to accept logic
pulses with 0 to 5 V swings. (V
IL
= 1.5V, V
IH
= 3.75 V, See Note 3,
Page 42.)
S5 - Same as S2, for Input 2.
S6 - Same as S3, for Input 2.
S7 - Same as S4, for Input 2.
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.
CHA
N.
B
CHA
NNEL
A
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