Accelnet & Stepnet Plus Panels STO Manual
16-01338 Rev 00
Page 29 of 34
Copley Controls
8.5 Troubleshooting
The status of the STO function in the
Accelnet & Stepnet Plus Panel
s servo drives can be viewed via LED
indicators on the drive, via data objects accessible over CANopen or EtherCAT connections, and using the
configuration software CME2. Other Copley software products such as CMO (Copley Motion Objects),
CML (Copley Motion Libraries), CPL (Copley Programming Language) and ASCII communications
can read the status of the STO function.
The LED indicators and data parameters are not part of the drive safety function. They are informational
only, and cannot be relied upon for any safety related functions of the user.
8.5.1 How to tell if the STO function is active
The voltage to one or both of the STO channels in the drive is < 6 Vdc, or open.
The Axis A and Axis B LEDs (on 2-axis drives) or AMP LED on 1-axis drives
double-flashes green, then pause. This pattern repeats when the STO function is active.
Bit 0 OR bit 1 of ASCII parameter 0x139 (DS-402 0x219D) is set (1).
The Safety LED on the CME2 Control Panel is red when the STO function is active.
Bit 2 of the DS-402 Status Word 0x6041 (Axis A) or 0x6841 (Axis B) is zero, indicating a hardware-
disabled state. This bit is controlled by any input that is programmed for the Enable function, and by the
STO function. When bit is zero, then it is necessary to check 0x219D (ASCII 0x139) to see if bit 0 or bit
1 is set (1). If this condition is true, then the STO function is active.
8.5.2 How to tell if the STO function is inactive
The voltage applied to both STO inputs of
the drive is ≥ 15 Vdc (wired in parallel).
The Axis A and Axis B LEDs (on 2-axis drives) or AMP LED on 1-axis drives
are solid green or slow-blinking green.
Bit 0 AND bit 1 of ASCII parameter 0x139 (DS-402 0x219D) are zero.
The Safety LED on the CME2 Control Panel is green when the STO function is inactive.
Bit 2 of the CANopen Status Word 0x6041 (Axis A) or 0x6841 (Axis B) is set(1), indicating a hardware-
enabled state. The drive cannot be hardware-enabled until all inputs programmed as Enable inputs are
true AND the bits 0 AND bit t in the STO function status parameter (0x219D) are zero.
8.5.3
Why can’t the STO function be deactivated?
The voltage between STO-IN1(+) and STO-IN1(-) is < 15 Vdc OR the voltage between STO-IN2(+) and
STO-IN2(-
) is < 15 Vdc. Both of these voltages must be ≥ 15 Vdc to deactivate the STO function
8.5.4
Why can’t the STO function be activated?
The voltage between STO-IN1(+) and STO-IN1(-) is > 6 Vdc AND the voltage between STO-IN2(+) and
STO-IN2(-) is > 6 Vdc. One or both of these voltages must be < 6.0 Vdc or the to activate the STO
function
8.5.5 The drive is hardware-
enabled but the motors don’t move.
The STO function may be active. Check the Axis A/B LEDs to see if they are double-flashing red.
If so, then the STO function is active. If not, check the LED blink patterns for indications of other faults or
conditions that may inhibit motion.
