S661 Controller Manual Exclusive Site

The S661 is a micro-processor based temperature controller designed for precision control. It typically features a dual 4-digit LED display, PID auto-tuning, and multiple output options (Relay, SSR, or 4-20mA).

Key Applications:

Version 1.0
For illustrative and educational purposes only – not an official manufacturer document. s661 controller manual exclusive

Use the WREG function in Ladder Logic:

LD IR33   // Load Temperature
GT K70    // Greater than 70c?
OUT OR40  // Trigger pre-alarm relay

The standard manual would flag IR33 as an "Invalid Address." Ignore that error. The compiler accepts it if you disable "Strict Address Checking" in the system flags (Flag 101). The S661 is a micro-processor based temperature controller

Do not use XMODEM. Use the Hidden YMODEM-G protocol.

Exclusive Warning: Never interrupt power between writing block 8 and block 9 during a firmware flash. If you cut power during this specific 400ms window, the bootloader enters a "zombie state" requiring a JTAG reflash. To exit zombie state without JTAG: cycle power 11 times in 10 seconds. This triggers the emergency fallback ROM (A feature only documented in the Chinese internal service manual). Version 1

The official manual provides a table for Input Registers (IR1 to IR32) and Output Registers (OR1 to OR16). That is the "public" map.