CTI 2502 2-Channel High Speed Counter Input Module

The 2502 module provides two high-speed 16-bit counter channels

in a compact, single-wide module to fit in the 2500 Series® I/O base.

The CTI 2502 Two-Channel High Speed Counter Input Module is a

member of Control Technology’s family of I/O modules compatible

with CTI 2500 Series™ and Simatic® 505 programmable controllers.

It is designed to count pulses on the inputs and return the current

count and status to the controller.

Features

• Replaces Siemens® 505-7002 with no rewiring

• Two independent high-speed 16-bit counter channels

• Each counter has

• pulse counter mode

• 1X, 2X, 4X quadrature counter modes

• 10 KHz count rate with minimum pulse width of 25us

• two count inputs, two outputs

• reset input and inhibit input

• LED indicators

The 2502 Two-Channel High Speed Counter Module has two independent

counting channels.  Each channel has four inputs. Each input may be

used as either sinking or sourcing (with external 5–24 VDC power supply).

The input signals are connected to the field wiring terminal block.

Reset - Current flow through the reset input sets the channel’s counter

to zero. The counter will be held at zero until the reset input becomes

inactive.

Inhibit - Current flow through the inhibit input inhibits the channel from

counting. The counter holds at the last value and does not change until

the inhibit input becomes inactive.

Counter Input A, Counter Input B - The relationship of the states of these

two inputs, combined with the counter mode setting, determines the

direction of the count. Typical devices for counting are high-speed static

switches or incremental encoders.