AI2 analogue input - 2 channel
This analogue input module is used to monitor analogue signals from a wide range of plant sensors, The mA and TC inputs each require the appropriate Thermal Unit. The second channel of the A12 has a special high impedance range for use with the zirconia probe inputs.
No of channels: 2
Input types: TC, RTD, Volts, mA, mV, Potentiometer, Pyrometer, Zirconia probe
mV range: -150mV to +150mV at input impedance >100MΩ
mA range: -22mA to +22mA with 5Ω burden in the terminal unit
Volts range: -10.2V to +10.2V at input impedance 303kΩ
RTD support: Support for 2, 3 and 4 wire resistance thermometer devices
Ohms range: 0 to 600Ω 3- or 4-wire lead compensation
Hi Ohms range: 0 to 5kΩ 3- or 4-wire lead compensation
Pot range: 5% to 95% ‘rotation’ of 100Ω to 5kΩ pot
AI3 analogue input - 3 channel
Provides three isolated current input channels specifically designed to meet the requirements of modern two wire transmitters. Each channel has its own isolated 24V supply for 3-wire transmitter excitation. Each channel is protected against short circuit （with 24V dc supply on） and utilises a sophisticated trip and try system where the module senses over current and cuts the power, after a period the circuit checks for continued circuit malfunction. The module can be optionally fitted with disconnects to allow isolation of an individual input to allow work on the loop to continue safely.
No of channels: 3
Input range: -28mA to +28mA
AI4 analogue input - 4 channel
This analogue input module is used to monitor analogue signals from a wide range of plant sensors. The mA and TC inputs each require the appropriate Terminal Unit.
No of channels: 4
Input types: TC, mV, mA, Pyrometer
mV range: -150 - +150mV at input impedance >100MΩ
mA range: -22 - +22mA with 5Ω burden in the terminal unit
 | T2550常用模件类型 AO2二通道模拟量输出卡，可冗余配置或单重配置 AO2 analogue output - 2 channel
This analogue output module provides two isolated analogue output channels. Each output may be independently configured for current or voltage mode. The module can be optionally fitted with disconnects to allow isolation of an individual output to allow work on the individual loop to continue safely.
No of channels: 2
Current output: -0.1 to 20.5mA; 10V dc maximum compliance
with total burden less than 500Ω
Voltage output: 0 to 10V dc; 20mA maximum compliance with
total load greater than 500ohms
-0.5 to 10.5 V dc; 20mA maximum compliance
with total load greater than 1500Ω
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 | T2550常用模件类型 DI4 2500 四通道开关量输入 （逻辑输入）
DI8_LG 2500 八通道开关量输入 （逻辑输入）
DI8_CO 2500 八通道开关量输入 （接点输入）
DI6_MV 2500 六通道开关量输入 （交流电输入, 115V rms）
DI6_HV 2500 六通道开关量输入 （交流电输入, 230V rms）
DI4 digital input - 4 channel
This digital input module accepts four logic inputs, and may be wired either for voltage input （either polarity） or for contact closure.
No of channels: 4
Input functions: On/Off, pulse and de-bounce
DI8 logic input - 8 channel
This eight channel digital input module accepts eight logic inputs and is available in two factory option formats for voltage or contact-closure input.
No of channels: 8
Input functions: On/Off. pulse and de-bounce inputs with input invert
DI6 AC voltage input - 6 channel
The six channel digital input module accepts AC voltage inputs and is available in two factory options optimized for 115V ac or 230V ac ranges.
No of channels: 6
Input functions: On/Off or de-bounce
Frequency: 47Hz-63Hz
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 | T2550常用模件类型 DO4_LG 2500 四通道开关量输出 （外部供电, 10mA）
DO4_24 2500 四通道开关量输出 （外部供电, 100mA）
RLY4 2500 四通道继电器输出 （6A/260Vac;3常开接点,1对常开/常闭接点）
RLY4（N） 新型四通道继电器输出6A/260Vac;3常开接点1对常开/常闭接点 ）
DO8（N） 新型八通道开关量输出
DO4 logic output - 4 channel
This digital output module provides four logic outputs and is available in two factory option formats for standard or high-current output.
No of channels: 4
Logic Variant
Voltage supply: 18 Output current: >8mA high drive per channel （Current limited）
Output Voltage: At least Voltage supply （Vs） -3V switch drop
24 Variant
External supply: 12 Output current: 100mA maximum high drive per channel
（Current & Temperature limited）
Output voltage: At least Voltage supply （Vs） -3V switch drop
DO8 - digital output - 8 channel
The DO8 provides higher packing density and lower cost per channel. The eight digital output module provides eight logic outputs, which are typically used for control, alarms or events outputs. Each channel a 24V output with 0.75A capability （subject of a maximum of 4A total per module） can be used for driving solenoids, relays, lamps, fans, thyristor units, single phase Solid State Relays （SSRs） or some three phase SSRs.
Voltage supply （external）: 18-30V dc to plant devices Vs
RLY4 - relay output - 4 channel
This digital output module provides four relay outputs. The relay contacts are all fitted with removable snubber circuits to reduce contact arcing and prolong contact life.
No of channels: 4 （3 normally open + 1 changeover）
Max current rating: 2A at up to 240V ac; 0.5A at 200V dc,
ncreasing to 2A at 50V dc （resistive）
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