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GE PACSYSTEMS RX3i / DISCRETE INPUT
IC694MDL645E
24 VDC Positive / Negative Logic Input Module
The IC694MDL645E is a PACSystems RX3i discrete input module designed for 24 VDC field signals. The module provides 16 input points in one group with a single common and supports either positive or negative logic wiring.
Its input characteristics are suitable for devices such as pushbuttons, limit switches and electronic proximity switches. A current flowing into an input point is represented as a logic 1 in the input status table.
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IC694MDL645E
POSITIVE / NEGATIVE LOGIC
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01 / PRODUCT ARCHITECTURE
A Flexible 24 VDC Discrete Input Interface
IC694MDL645E provides sixteen discrete input points for an RX3i controller system. All sixteen inputs belong to one group and share a common power-input terminal, making the module suitable for field devices that operate around the 24 VDC control level.
The module supports both positive and negative logic. This gives the same hardware greater flexibility when the field wiring arrangement changes between sourcing-type and sinking-type devices.
The input voltage range extends from 0 to +30 VDC. The specified ON-state region is 11.5 to 30 VDC, while 0 to +5 VDC is recognized as the OFF-state region.
Sixteen green LEDs provide individual visual indication for input states. The module can be installed in any I/O slot of an RX3i system.
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SIGNAL PATH
Field Device → Input Point → %I
01 Field device generates a 24 VDC discrete signal.
02 Signal enters one of the 16 input points.
03 Input circuitry determines ON/OFF state.
04 Controller receives the corresponding %I status.
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MODULE TYPE
Discrete Input
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RATED VOLTAGE
24 VDC
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INPUT POINTS
16
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LOGIC
Positive / Negative
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INPUT VOLTAGE RANGE
0 to +30 VDC
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ON-STATE VOLTAGE
11.5 to 30 VDC
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OFF-STATE VOLTAGE
0 to +5 VDC
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INPUT CURRENT
7 mA typical
at rated voltage
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ON-STATE CURRENT
3.2 mA minimum
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OFF-STATE CURRENT
1.1 mA maximum
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ON RESPONSE
7 ms typical
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OFF RESPONSE
7 ms typical
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INPUT ORGANIZATION
1 Group / Single Common
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FIELD DEVICES
Switches / Sensors
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POINT INDICATION
16 Green LEDs
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BACKPLANE CONSUMPTION
80 mA at 5 VDC
all inputs ON
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24 VDC CONSUMPTION
125 mA
isolated 24 V bus / user supply
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FIELD / BACKPLANE ISOLATION
Optical Isolation
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FIELD / BACKPLANE
250 VAC Continuous
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FRAME GROUND
1500 VAC / 1 min
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Positive or Negative Logic
The IC694MDL645E is designed around a positive/negative logic input architecture. This allows the input points to accommodate different field wiring conventions while retaining the same 24 VDC input module.
At the specified ON-state voltage, the input circuitry recognizes the field signal as active. At 0 to +5 VDC, the input is within the specified OFF-state region.
The module is intended for discrete signal acquisition rather than analog measurement. The controller receives the resulting point state through the input status table.
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INPUT STATE MAP
16 individual green LEDs provide direct ON/OFF indication for the sixteen input points.
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IC694MDL645E
16-Point / 24 VDC
Provides 16 discrete inputs, uses 24 VDC signaling and supports both positive and negative logic.
One common group · 7 ms typical response · 16 point LEDs
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IC694MDL646
16-Point / FAST
The same general 24 VDC positive/negative logic input concept is offered with a faster response configuration.
Choose by response-time requirement rather than treating the two catalog numbers as identical configurations.
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IC694MDL655
32-Point / 24 VDC
Extends the same 24 VDC positive/negative logic concept to 32 input points, arranged in four groups of eight.
Higher point count · four input groups · different grouping architecture
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Point Count
IC694MDL645E provides 16 input points; higher-density modules change the channel count and wiring arrangement.
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Signal Level
The IC694MDL645E is designed around 24 VDC discrete signals with an input range up to 30 VDC.
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Logic Convention
Positive and negative logic capability allows flexible field-device wiring.
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Response
The standard MDL645 response characteristic is approximately 7 ms for both ON and OFF transitions.
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03 / DIRECT INQUIRY
Need IC694MDL645E?
For a quotation or replacement inquiry, provide the part number, required quantity, destination and required date. If the module is being matched to an installed RX3i system, including the controller and existing I/O arrangement can help with configuration checking.
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Inquiry Checklist
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ORDER SUPPORT
Delivery · Warranty · Packaging · Payment
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Return & Replacement
01 · Please contact us within 7 days after receiving the item if an issue occurs.
02 · Returned items should remain in original condition and include the specific reason for return.
03 · A return or replacement can be arranged after the returned item is received.
04 · Return shipping costs are the buyer's responsibility.
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01. Is IC694MDL645E suitable when an existing RX3i system uses both sourcing and sinking field devices?
The module supports positive and negative logic, allowing the 16 input points to be wired according to the field-device arrangement. This makes the MDL645 architecture applicable where the control system needs flexibility in discrete input wiring rather than a positive-logic-only input configuration.
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02. What should be checked when replacing an IC694MDL645E in a running 24 VDC input circuit?
The replacement should be matched to the existing 24 VDC signal level, positive/negative logic arrangement, common connection and sixteen-point channel assignment. Field wiring should also be checked against the terminal arrangement before returning the system to service.
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03. Can IC694MDL645E accept a field signal above 24 VDC?
Yes, within its specified input range. The module is rated at 24 VDC and accepts an input voltage range of 0 to +30 VDC. The specified ON-state region extends from 11.5 to 30 VDC, while 0 to +5 VDC is the specified OFF-state region.
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04. Does IC694MDL645E make sense when the application needs faster discrete-input response?
The standard MDL645 input response is approximately 7 ms for both ON and OFF transitions. If the application has tighter response requirements, the RX3i family includes a separate fast 16-point 24 VDC positive/negative logic configuration, so the required response characteristic should be considered before selecting the replacement module.
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05. Why can IC694MDL645E be useful when the existing field wiring has a shared common?
The module organizes all sixteen inputs as one group with a single common power-input terminal. This matches applications where the field input devices are arranged around a common reference rather than requiring separate isolated groups for subsets of the sixteen channels. The common arrangement should be matched with the actual field wiring before replacement.
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