GE IC693MDL645B Input Module

This input module provides discrete input capability for GE Series 90-30 PLC systems. It interfaces directly with field sensors such as limit switches and proximity detectors. Therefore, it captures real-time status signals for programmable logic controller processing.

Physical and Input Specifications

The GE IC693MDL645B measures 12.5 cm in length and 9.0 cm in width. Moreover, its module weight equals approximately 0.26 kg for rack mounting. A single 20-pin removable terminal block handles all field wiring connections. Additionally, this module contains sixteen independent digital input channels.

Parameter	Specification
Brand	General Electric (GE)
Full Model	IC693MDL645B
Category	Input Module
Dimensions (L x W x H)	12.5 cm x 9.0 cm x 5.5 cm (4.92″ x 3.54″ x 2.17″)
Module Weight	0.26 kg (0.57 lbs)
Primary Interface	1 x 20-pin Removable Screw Terminal Block
Backplane Interface	1 x 48-pin Male Connector (Series 90-30 Rack)
Operating Voltage	24 VDC from Backplane (19.2 to 28.8 VDC)
Power Consumption	2.0 W (Typical)
Input Channels	16 Independent Channels
Input Type	24 VDC (Sink/Source Selectable per Group)
Input Voltage Range	0 to 30 VDC
Input On-State Voltage	> 15 VDC
Input Off-State Voltage	< 5 VDC
Input On-State Current	7 mA Typical at 24 VDC
Input Impedance	3.4 kΩ
Input Response Time (On)	4 ms (Typical)
Input Response Time (Off)	4 ms (Typical)
Input Isolation	Optocoupler (1500 Vrms)
Common Configuration	16 Inputs Share Two Commons (8 per Group)
On-Board Components	16 Optocouplers + 16 Current Limiting Resistors + 4 Protection Diodes + 1 EMI Filter + 1 Voltage Regulator + 1 LED Driver IC
Energy Storage	2 x 100 µF Electrolytic Capacitors (35V) + 2 x 10 µF Tantalum (25V)
Operating Temperature	0°C to +60°C (32°F to 140°F)
Storage Temperature	-25°C to +85°C (-13°F to 185°F)
Mounting Type	Series 90-30 PLC Rack (Single Slot)
Status Indicators	16 Green LEDs (One per Channel) + 1 Green LED (Power)

Input Channel Features and Signal Processing

The GE IC693MDL645B accepts sixteen independent discrete input signals at 24 VDC. Specifically, each input includes an optocoupler for complete electrical isolation from the logic side. In addition, the input impedance of 3.4 kΩ suits standard industrial proximity sensors. Moreover, all sixteen channels respond within 4 milliseconds to signal changes. Furthermore, the two common groups allow mixed sink and source wiring for different field devices. Consequently, this module captures fast field events without missing critical transitions.

High-Density Input Configuration

Sixteen input channels fit into a single Series 90-30 rack slot with this module. For instance, you can monitor up to sixteen limit switches or push buttons with one module. In addition, the removable screw terminal block accepts 18-22 AWG stranded or solid wires. Moreover, each channel includes an independent green LED for visual status monitoring. Furthermore, the module requires no external power supply for input circuits. Thus, this module saves valuable rack space in large PLC systems.

Energy Storage and Operational Stability

This input module stores energy using four onboard capacitors for power filtering. Specifically, two electrolytic capacitors smooth the 24 VDC supply for stable optocoupler operation. In addition, two tantalum capacitors provide high-frequency noise suppression for the input circuits. Furthermore, these capacitors maintain stable operation during brief power interruptions. Therefore, the GE IC693MDL645B continues functioning through minor supply dips reliably.

Installation and Diagnostic Indicators

Seventeen LED indicators provide operational status at a glance on this module. First, a green Power LED lights when the backplane operating voltage is present. Second, sixteen green input status LEDs illuminate when each corresponding input receives an active 24 VDC signal. Additionally, the module includes a keying mechanism for correct rack insertion. Thus, you can diagnose system status instantly without external tools or meters.