Sto Terminal Functions; Safety Function - Sto (Safe Torque Off)21-36; Operation Procedure Of Safety Function21-36 - Hitachi SJ Series User Manual

Chapter 21

21.4 STO Terminal Functions

Safety Function – STO (Safe Torque Off)
21.4.1
・The SJ Series P1 is equipped with the STO (Safe
torque off) function defined in IEC61800-5-2.
This function is equivalent to stop category 0 defined in
EN/IEC60204-1.
・The section describes only the functions of STO
terminals. If this product is handled as a product
with certification of safety function, make sure to
check the SJ-P1 Safety Function Guide separately
provided, and perform work (verification, validity
confirmation, etc.) required for a functional safety
system. The contents described in the SJ-P1 Safety
Function Guide shall take precedence.
Control circuit terminal area
Connection of STO input terminal
S
When shipped from the factory,
wiring is performed so that STO
terminal is disabled.
Always drive the STO function
using both STO inputs.
Terminal specifications
Terminal symbol Terminal name
24V output terminal
P24S
(for STO input only)
24V output terminal common
CMS
(for STO input only)
STC Input logic switching terminal
ST1/ST2 STO input terminal
EDM signal output terminal
ED+
(+)
EDM signal output terminal
ED-
(-)
21.4.2
STO input terminal
・Input of STO signal is performed by redundant input of
STO terminals ST1 and ST2.
・When voltage is applied to each input terminal and
current flows, operation of safety path is enabled.
(When shipped from the factory, operation is always
enabled. See the figure below.)
・If voltage is not applied to at least one of the input
terminals, the corresponding blocking path shuts off
output of the inverter.
STO terminal
ST2 STC
P24S STC CMS
Sink logic inverter
model:
P1-*****-*FF
or
P1-*****-*FUF
Description
A DC24V power supply for contact signals
dedicated for ST1/ST2 terminals. The common
terminal is CMS.
A common terminal for DC24V power supply for
contact signals dedicated for ST1/ST2 terminals.
A logic switching terminal for STO input.
You can change the input logic changing the
connecting point of short-circuit line.
When an external power supply is used, remove
the short-circuit line and use this terminal as the
input common for ST1/ST2.
An input terminal of STO.
A plus terminal of EDM signal (STO status
monitoring).
A minus terminal of EDM signal (STO status
monitoring).
21-36
Technical Notes
Operation Procedure of Safety Function
STO terminal
ST1 ST2 STC
P24S STC CMS
Source logic inverter
model:
P1-*****-*FEF
or
P1-*****-*FCF
Electrical characteristics
Maximum output current: 100mA
<for sink logic>
Short-circuit line: Connect between
P24S and STC
<For source logic>
Short-circuit line: Connect between
CMS and STC
Voltage between ST1 and STC/ST1
and STC
・ON voltage: Min.DC15V
・OFF voltage Max. DC5V
・Maximum allowable voltage
DC27V
・Load current 5.8mA (at DC27V)
Internal resistance: 4.7kΩ
Open collector output
・Between ED+ and ED-
・Voltage drop at ON: 4V or less
・Maximum allowable voltage: 27V
・Maximum allowable current: 50mA
ST1