Overview
Hardware Specifications
| Parameter | Specification |
|---|---|
| Model | F8621A |
| Brand | HIMA |
| Product Type | CPU Module |
| Associated System | H41q/H51q PES |
| Coprocessor | HD 64180 microprocessor |
| Clock Frequency | 10 MHz |
| Memory Capacity | 384 kB static memory |
| Memory Components | CMOS RAM and EPROM on 2 ICs |
| Serial Interfaces | 2 x RS-485, half-duplex |
| Interface Isolation | Galvanic isolation |
| Communication Processor | Dedicated communication processor |
| Transmission Rates | 300, 600, 1200, 2400, 4800, 9600, 19200, 38400 and 57600 bps |
| Space Requirement | 4 TE |
| Operating Current at 5 VDC | 360 mA |
| Country of Origin | Germany |
| Estimated Shipping Size | 2 x 18.7 x 12.8 cm |
| Weight | 0.16 kg |
| HS Code | 8537101190 |
Coprocessor and Memory Functions
The F8621A coprocessor combines local processing with memory and communication functions. Its 384 kB static memory uses CMOS RAM and EPROM installed on two integrated circuits. The F7131 power supply monitoring module provides battery buffering for the RAM, helping retain stored data when normal power is interrupted.
In addition, dual-port RAM allows the coprocessor and a second central module to access shared data quickly. This arrangement supports inter-module data exchange without relying solely on the serial interfaces.
RS-485 Communication
The module provides two half-duplex RS-485 interfaces, each supported by galvanic isolation and a dedicated communication processor. These interfaces support transmission rates from 300 to 57600 bps.
The software can set the transmission rate. Alternatively, the module can adopt the values configured through the CU’s DIP switches, according to the supplied technical information. Therefore, maintenance personnel should verify the communication settings at both ends before commissioning or replacing the module.
Installation and Configuration
Before installing a replacement F8621A, check the existing system configuration and confirm that the module matches the required H41q/H51q application. Also, reserve 4 TE of mounting space and verify that the 5 VDC supply can provide the specified 360 mA operating current.
For serial communication, confirm the required baud rate and the selected configuration method. In addition, check the F7131 battery-buffering arrangement if the application requires RAM data retention. The supplied information does not specify connector pin assignments or cable requirements, so verify these details against the applicable system documentation.
Frequently Asked Questions
Q: What does the HIMA F8621A CPU module do?
A: The F8621A is identified as a CPU module associated with the H41q/H51q PES. Its documented coprocessor provides local processing, static memory, RS-485 communication, and dual-port RAM for data exchange with a second central module.
Q: Which communication rates does the F8621A support?
A: The two half-duplex RS-485 interfaces support rates from 300 to 57600 bps. The software can configure the rate, or the module can use the values set through the CU’s DIP switches.
Q: How does the module support RAM data retention?
A: The F7131 power supply monitoring module provides battery buffering for the RAM. Therefore, maintenance personnel should check the condition of this supporting arrangement when replacing the CPU module or servicing the system.
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