GE IC697MDL740 Series 90-70 16-Point Discrete Output Module

GE IC697MDL740 Series 90-70 Discrete Output Module

The GE IC697MDL740, also cataloged as the IC697MDL740 Discrete Output Module, operates as a dedicated hardware component for switching direct-current load circuits within GE Series 90-70 PLC platforms. The module provides 16 discrete output channels designed to control solenoid valves, relay coils, and indicators operating between 20 VDC and 60 VDC. Operating personnel monitor channel state and fault conditions directly through top-mounted LED indicators, while mechanical keying mechanisms physically prevent insertion of incorrect module types into designated backplane slots.

Hardware Specifications

Backplane Bus Communication Velocity & Firmware Integrity

The IC697MDL740 module interface circuit reads status commands directly from the VME-based backplane bus during each CPU scan sweep. Consequently, the internal logic decoder processes state transitions rapidly to drive high-current output switches with minimal backplane latency. Furthermore, onboard hardware components validate firmware flash compatibility during boot sequences, while optical isolation barriers shield the sensitive backplane bus logic lines from inductive transient spikes generated by external DC field loads.

Frequently Asked Questions

Q: How do technicians clear fault indication LEDs when a channel fuse blows on the IC697MDL740?

A: Field engineers must isolate field power, remove the front wiring connector, and replace the internal blown fuse with an equivalent rated fast-acting fuse. Afterwards, restoring logic and field power clears the fuse status LED.

Q: Does the IC697MDL740 support hot-swapping under live field power conditions?

A: No, field maintenance teams must turn off system backplane power and external 20-60 VDC field supply voltages before replacing the module to prevent electrical arcing across backplane pins.

Q: How does the module handle high surge currents when driving heavy inductive loads?

A: Solid-state output drivers allow temporary surge currents up to 10 times the rated current (20 A surge peak), while flyback protection suppression diodes absorb high-voltage inductive kickback across output terminals.

Field Installation Guidelines

1. Disconnect main rack power and field supply voltages before inserting the module into the Series 90-70 backplane.
2. Verify mechanical keying slots on the backplane match the plastic keyed pins on the rear of the module connector.
3. Slide the module board evenly along the upper and lower chassis guides until the backplane connector seats firmly.
4. Route discrete field output conductors separately from low-level analog or communication wiring to minimize electromagnetic interference.
5. Secure external wiring harness screw terminals to a torque specification of 0.8 Nm to 1.0 Nm, ensuring clean copper-to-terminal engagement.