SLC 100 behavior
With an SLC 100, an access code on 1745-M1 requires the programmer for loading; automatic loading does not bypass that code.
NONVOLATILE PROGRAM TRANSFER
Allen-Bradley 1745-M1 EEPROM Memory Module
A removable nonvolatile program module for SLC 100 and SLC 150 controllers.
EEPROM MODULEM1
SLC 100/150
Memory Module Profile
Allen-Bradley 1745-M1 is a nonvolatile EEPROM memory module for SLC 100 and SLC 150 programmable controllers. It occupies the processor-unit EEPROM compartment and stores a controller program outside the processor RAM.
The 1745-M1 supports store and load operations between processor RAM and EEPROM. The module has a write-on identification area, and insertion or removal is performed only with processor power off.
For an SLC 150 processor, 1745-M1 must be Series B or a Series A module with a 28-pin chip. The same physical module can fit SLC 100 and SLC 150 processors, but the stored program must remain identified with its controller because the two controller families differ in internal addresses and other program details.
VERIFIED OPERATING VALUES
Compatibility Data
| Technical Item | 1745-M1 |
|---|---|
| Brand | Allen-Bradley |
| Product Type | EEPROM memory module |
| Brand Country | United States |
| Compatible Controllers | SLC 100 and SLC 150 |
| Memory Technology | EEPROM, nonvolatile |
| Maximum Program Size | 1200 words |
| Primary Functions | Store, load and auto-load |
| SLC 150 Series Support | Series B; Series A with compatible 28-pin device |
| Program Interchange | SLC 100 and SLC 150 programs must remain identified separately |
| Operating Temperature | 0–60 °C |
| Storage Temperature | -40–85 °C |
| Relative Humidity | 5–95%, noncondensing |
| Handling | Power-down insertion/removal per manual |
| Identification Need | Label module with controller and program revision |
PROGRAM SECURITY
Access-Code Controlled Loading
Matching SLC 150 code
With an SLC 150, automatic loading is permitted when the EEPROM access code matches the processor access code.
EEPROM without a code
An EEPROM without an access code can auto-load into an SLC 150 whether or not the processor itself has a code.
RECOVERY FUNCTION
Checksum-Triggered Auto-Load
The two controller families invoke EEPROM loading in different ways.1745-M1
With an SLC 100, power-up with 1745-M1 installed duplicates the EEPROM contents into RAM and erases the previous RAM program when access-code conditions permit.
- The SLC 100 processor must initially be in Run mode for the documented auto-load procedure.
- An SLC 150 program can use address 864 in rung 1 to request loading after a memory checksum error.
- The SLC 150 checksum condition can result from capacitor-backup drain, battery-backup drain or a processor malfunction.
FIELD QUESTIONS
Program Handling FAQs
What is 1745-M1 used for?+
It is a nonvolatile EEPROM module for storing, loading or automatically loading an SLC 100 or SLC 150 program.
Can 1745-M1 hold a full SLC 150 program?+
It supports up to 1200 words, matching the documented SLC 150 program capacity. Verify the actual project size before storing.
Why should 1745-M1 be labeled after a store operation?+
The module itself does not protect a technician from loading the correct file into the wrong controller. Record the machine, controller family and revision.
Can an SLC 100 program in 1745-M1 be loaded into an SLC 150?+
Do not interchange them. The families use different internal address assignments even though the EEPROM hardware is shared.
What must be checked for Series A hardware before using 1745-M1?+
The manual notes compatibility requirements around the 28-pin device. Verify the controller hardware and publication procedure before installation.
When should auto-load be enabled on 1745-M1?+
Only when the documented recovery strategy requires the controller to reload the EEPROM program automatically. Otherwise it can restore an outdated file unexpectedly.
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