Compatible Devices
- Eurotherm 631 / 635 / 637 Digital Drives [ssd-euroth..._drives-g3 | Word]
Verified Device
- 635f/KD6R16.S5‑7‑0‑485‑000‑RD12 [ssd-euroth..._drives-g3 | Word]
Device Options
- Axis number selectable per device [ssd-euroth..._drives-g3 | Word]
Accessible Data
Core Access
VAR → Variables (R/W)
FLG → Single flag (R/W)
FGP → Group of 32 flags (read) [ssd-euroth..._drives-g3 | Word]
FGP Flag Mapping
0 → Flags 31–0
1 → Flags 63–32
2 → Flags 95–64
3 → Flags 127–96
4 → Flags 159–128
5 → Flags 191–160
6 → Flags 223–192
7 → Flags 255–224 [ssd-euroth..._drives-g3 | Word]
Command Prefix
All commands use:
C# [ssd-euroth..._drives-g3 | Word]
Error Handling
ERR → Stores command number causing error
Write any value → clears to 0 [ssd-euroth..._drives-g3 | Word]
Commands (Write Only)
C0 → Disable
C1 → Enable
C2 → Reset
C3 → Host Login
C4 → Host Logout
C5 → EEPROM Transfer
- Write any value to execute
- Read returns all bits set [ssd-euroth..._drives-g3 | Word]
Read-Only Commands
C6 → Firmware version
C7 → Diagnostics
C22 → EEPROM pointer
C33 → BIAS diagnostics
C40 → I/O diagnostics [ssd-euroth..._drives-g3 | Word]
Write-Only Commands
C13 → Set BIAS pointer
C23 → Positioning command
C36 → Start position set
C47 → Speed setpoint [ssd-euroth..._drives-g3 | Word]
Read / Write (Single Values)
C14 → Axis number
C62 → Rated motor current
Note: Changing C14 breaks communication unless reconfigured [ssd-euroth..._drives-g3 | Word]
Read / Write (Block Commands)
C65 → Configuration
C66 → Speed control
C67 → Current control
C68 → Position control
C69 → Position set
C72 → Cam profile
C73 → Profile block
C74 → I/O definition
C76 → BIAS program
C78 → Extended parameters [ssd-euroth..._drives-g3 | Word]
Set Number Required
C69, C72, C73, C76 [ssd-euroth..._drives-g3 | Word]
Cache / Read Logic
CFxx = 0 → read controller
CFxx = 1 → read cache
CTxx → load controller data into cache [ssd-euroth..._drives-g3 | Word]
Write Sequence (Method 2)
- Set set number (example C73A)
- CF73 = 1
- CT73 = 1
- Modify values
- C73 = 1
- CF73 = 0 [ssd-euroth..._drives-g3 | Word]
Cable Information
RS232 (COM1)
Tx → Pin 5 → Rx Pin 1
Rx → Pin 2 → Tx Pin 2
Common → Pin 4 → Pin 4
RS232 (COM2 Design A)
Tx → Pin 5 → Rx Pin 2
Rx → Pin 2 → Tx Pin 3
Common → Pin 4 → Pin 5
RS422 / RS485
TxB → Pin 1 → Data In
TxA → Pin 2 → Data In Inverted
RxA → Pin 3 → Data Out Inverted
RxB → Pin 4 → Data Out
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