| Switch (SW1) Position | Function (Ver 1.0) | |------------------------|---------------------| | 1–4 | Binary address (ON=1, OFF=0) Example: Switch 1 ON = +1, Switch 2 ON = +2, etc. | | 5 | ON = RS-485, OFF = RS-232 | | 6 | ON = 19200 baud, OFF = 9600 baud | | 7 | ON = No parity, OFF = Even parity | | 8 | ON = 2 stop bits, OFF = 1 stop bit | Cycle power after changing DIP switches. Ver 1.0 does NOT support software-overridden DIP settings. 3.2 Modbus Register Map (Ver 1.0 Only) The manual lists the following key addresses (holding registers, function code 0x03/0x06):
| Register (Decimal) | Description | Data format | |--------------------|-------------|--------------| | 40001 (0x0000) | Firmware version read-only → returns 0x0100 for Ver 1.0 | uint16 | | 40002–40017 | AI0 raw value (0–65535) through AI15 raw value | uint16 | | 40018–40021 | AO0–AO3 raw value (write 0–16383) | uint16 | | 40022 | Digital input status: bit0=DI0, bit1=DI1 | bitmask | | 40023 | Digital output control: bit0=DO0, bit1=DO1 | bitmask | | 40100 | System status: bit7=over-temperature, bit6=24V low | bitmask | ms 7826 ver 1.0 manual
For archival purposes, preserve a physical copy of the MS 7826 Ver 1.0 manual inside your control cabinet, as digital scans often omit the critical trimmer calibration maps and timing diagrams. | Switch (SW1) Position | Function (Ver 1
Document ID: MS-7826-V1.0-ENG Firmware Baseline: Version 1.0 Product Series: MS 7800 Industrial Control Series Introduction The MS 7826 Ver 1.0 is a specialized industrial control module, typically found in automated manufacturing environments, legacy PLC (Programmable Logic Controller) systems, or precision instrumentation racks. The "MS" designation often points to a Measurement Systems or Master Slave controller, while the 7826 model number identifies a 24-channel mixed I/O unit with isolated analog inputs. typically found in automated manufacturing environments
[01][03][00][01][00][01][CRC_H][CRC_L] Section 4: LED Diagnostics and Error Codes (Ver 1.0 Manual, Appendix B) The MS 7826 features three LEDs on the front panel:
Visit the manufacturer’s legacy support archive at support.ms7800series.com/legacy (requires serial number of your unit). Document last updated based on original MS 7826 Ver 1.0 manual revision 1.0, released June 2012.
| LED | Color | Indication (Ver 1.0) | |-----|-------|----------------------| | PWR | Green | Solid = 24V present. Off = no power. | | COM | Yellow | Blinking = RS-232/485 activity. Solid = bus conflict or CRC error. | | ERR | Red | 1 flash/sec = configuration checksum error. 3 flashes = watchdog timeout. Solid = unrecoverable hardware fault. |