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1764-MM3RTC
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Other Available Revisions for the 1764-MM3RTC 1764-MM3RTC//A
Common misspellings:
- l764-MM3RTC
- 176A-MM3RTC
- 1764MM3RTC
Technical Specifications for 1764-MM3RTC
| Manufacturer: | Rockwell Automation |
|---|---|
| Brand: | Allen-Bradley |
| Product Family: | MicroLogix 1200 |
| Product Type: | Memory Module |
| Part Number: | 1764-MM3RTC |
| Supported controllers: | 1764-L24AWA; 1764-L24BWA; 1764-L28BXB |
| Supported controllers: | 1764-LRP; 1764-LSP |
| Allowable Functions: | User Program and Data Back-up, User Program Compare, Data File Download Protection, Memory Module Write Protection and Removal/Insertion Under Power |
| Real Time Clock Accuracy: | 0 ¡C or +32 ¡F, accuracy is +34 to -70 seconds/month. For +25 ¡C or +77 ¡F, accuracy is +36 to -68 seconds/month, for +40 ¡C or +104 ¡F, rated accuracy is +29 to -75 seconds/month and at +55 ¡C or +131 ¡F, accuracy is -133 to -237 second |
| Mounting: | Memory Module slot |
| User Memory: | 16 Kbytes |
| Operating Temperature: | 0-55 deg.C |
| Support automatic loading: | Yes |
| Support for removal under power: | Yes |
| System Status File: | S:2/9 Memory Module Program Compare |
| Control Bits: | Load Memory Module on Memory Error S:1/10 Load Memory Module Always S:1/11 On Powerup, Go to run S:1/12 |
| system Overhead: | 80 µs |
| Configuration Software | RSLogix 500; |
About 1764-MM3RTC
The Allen-Bradley 1764-MM3RTC is a combination module that features an integrated memory module real-time clock installed in a common assembly. This dual component module is installed to the memory module slot of any MicroLogix 1500 base unit. It proves to be a cost-effective solution as this memory module is also capable of saving the data from the Data Log Queue area. The included Real-Time Clock (RTC) has an accuracy of 0 ¡C or +32 ¡F, accuracy is +34 to -70 seconds/month. For +25 ¡C or +77 ¡F, accuracy is +36 to -68 seconds/month, for +40 ¡C or +104 ¡F, rated accuracy is +29 to -75 seconds/month and at +55 ¡C or +131 ¡F, accuracy is -133 to -237 seconds/month. These values are expected worst case values over a 31-day period. The function file intended for the RTC components includes data such as YR - RTC Year with PLC address of RTC:0.YR; MON - RTC Month with address of RTC:0.MON; DAY - RTC Day of Month with address RTC:0.DAY; HR - RTC Hours with address RTC:0.HR; MIN - RTC Minutes with address of RTC:0.MIN; SEC - RTC Seconds with address of RTC:0.SEC; DOW - RTC Day of Week with address of RTC:0.DOW; DS - Disabled with address of RTC:0/DS and BL - RTC Battery Low with address of RTC:0/BL. The provided addresses support inclusion to the user program for monitoring specific time and date aspects. The RTC has a non-replaceable battery. This battery is provided with a battery indicator bit with address RTC:0/BL. It can be used in the user program for inclusion in the logic and further integrated in monitoring or computer-based control systems for visual indication. The operating temperature of the battery is 0¡C to +40¡C or +32¡F to +104¡F with time duration of 5 years. The memory module in this module has a memory size of 16KB non-volatile memory. It is an EERPOM type which is capable of retaining data without the need of a battery unlike the controllerÕs internal battery. In actual operation, the controller reads the internal memory area provided with the processor. If a memory module is present, the contents of the memory module is copied to the internal memory during each power cycle. The contents of the internal memory are retained by a lithium battery with applicable replacement part number of 1746-BA which only operates when the base unit or controller assembly is without power. When power is applied, the internal memory contents is retained by the external power supply. When both the external power supply and the battery is voltage is gone, the internal memory loses its contents, causing erasure of program. This is where the 1764-MM3RTCÕs Program and Data backup becomes useful as it is not affected by the event. User only needs to power cycle the controller initiate copying of the contents of the memory module to the internal memory to make the controller functional again. Up to only One (1) user program may be stored in the memory module. It may also be used to store Recipe data which was stored to Data Log Queue area in the MicroLogix 1500 LRP. This is one of the unique functions that the 1764-MM3RTC and 1764-MM3 compared to other memory modules.F.A.Q for 1764-MM3RTC
| Q: 1. What is the difference of 1764-MM2RTC and 1764-MM3RTC? | A: 1764-MM3RTC is capable of saving the data from the data Log Queue area. Specifically, Recipe data which was stored to Data Log Queue area in the MicroLogix 1500 LRP can be stored to the 1764-MM3 and 1764-MM3RTC. |
|---|---|
| Q: 2. Can I implement security or write protection in this module? | A: Yes, write protection may be implemented with the module. |
| Q: 3. Can I use the 1764-MM1 as memory module of MicroLogix 1200 controller? | A: o, 1764 Memory module are compatible with MicroLogix 1500 controllers only. |
PDFsupply Tech
The 1764-MM3RTC is a combination memory and Real-Time clock module. This module has 16KB memory with capability of saving recipe data unlike the 1764-MM2RTC. This memory module is ideal for use in applications with recipe applications.
