Digital I/O module CT-121F
ModbusEthernetModbus RTU

digital I/O module
digital I/O module
digital I/O module
digital I/O module
digital I/O module
digital I/O module
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Signal type
Modbus, Ethernet, Modbus RTU, serial, Modbus TCP, CC-Link, CANopen, DeviceNet, ProfiNet, EtherCAT, PROFIBUS, CAN Bus, PROFIBUS-DP
distributed, remote, network, safety
for sensors, automation, PLC, temperature, voltage, current, for temperature sensors, for HMI interface, for the food industry, for lighting control
Number of inputs/outputs
16 digital inputs, 16-channel, safe digital inputs
DIN rail
Other characteristics
compact, configurable, rugged, IP, TCP/IP Ethernet


CT-121F:16 channel digital input/24VDC/ Sink type Module features ◆ the module supports 16 channels digital input, supports sink input, and the input voltage is 24VDC and the input high level is valid. ◆ the module can collect digital output signal of field equipment (dry contact or active output). ◆ the module can be accessed to 2-wire or 3-wire digital sensor. ◆ the internal bus and field input of the module use opto-isolator. ◆ the module supports the input signal holding function, and the holding time can be set. ◆the module carries 16 digigtal input channels with LED indicator on each channel. ◆ supports counting function, by adding counting sub-module. ◆ each input channel of the module supports a 32-bit counter with the counting frequency 7.5kΩ Input delay - OFF to ON: Max.3ms ON to OFF: Max.2ms filter time - Default:10ms Sample frequency:500Hz Counter frequency:<200Hz


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