Publication 1747-UM011G-EN-P - June 2008
Suitable surge suppression methods for inductive ac load devices 
include a varistor, an RC network, or an Allen-Bradley surge 
suppressor. These components must be appropriay rated to 
suppress the switching transient characteristic of the particular 
inductive device.
For inductive dc load devices, a diode is suitable. A diode, catalog 
number 1N4004, is acceptable for most applications. 
A surge suppressor can also be used. See the table on page 49.
Locate the suppression device as close as possible to the load device.
Transistor OutputTransient Pulses
This section applies to the following SLC 500 fixed I/O processors and 
SLC 500 I/O modules that have transistor outputs.
For the SLC 500 products listed above, the maximum duration of the 
transient pulse occurs when minimum load is connected to the 
output. However, for most applications the energy of the transient 
pulse is not sufficient to energize the load.
Fixed I/O processors with 
transistor outputs
I/O modules with transistor outputs
•1747-L20E
•1747-L20G
•1747-L20L
•1747-L20N
•1747-L30L
•1747-L40E
•1747-L40L
•1746-OB8
•1746-OBP8
•1746-OV8
•1746-OB16
•1746-OB16E
•1746-OB16EI
•1746-OBP16
•1746-OV16
•1746-OVP16
•1746-OB32
•1746-OB32E
•1746-OV32
ATTENTION
A transient pulse occurs in transistor outputs when the external 
dc supply voltage is applied to the common output terminals (for 
example, via the master control relay). The sudden application of 
voltage creates this transient pulse. (See the following graph.) 
This condition is inherent in transistor outputs and is common to 
solid state devices. A transient pulse can occur regardless of the 
processor having power or not.Indramat TDM 3.2-030-300-W1
Indramat DDS02.1-W050-D
Indramat 025B-0-ZS-3-E/040-B-1
Indramat CLM 01.3-X-0-2-0 
Indramat KVR 1.3-30-3
Indramat TVD 1.2-15-03
Phoenix Interbus-S IBS RT 24 DIO 16/16-T
Phoenix Contact Interbus-S IBS S5 DCB/I-T
Phoenix Interbus-S IBS RT 24 AIO 4/2-T
Phoenix Contact Interbus-S IBS S5 DCB/I-T
Phoenix Interbus-S IBS RT 24 DI 32-T
Phoenix Interbus-S IBS RT 24 DI 16-T
Phoenix Interbus IBS CT 24 I/O GT-LK
Phoenix Interbus PSM-EG-RS232/TTY-P/2K
Phoenix IBS STTB ZF 24 BK-LK
Phoenix Interbus IB ST ZF 24 DO32/2
Heidenhain Typ: 359 002-05 359002-05
Heidenhain Typ: 324 952-12 Id.Nr. 32495-12
Heidenhain Typ: 324 952-03 Id.Nr. 324955-15
Heidenhain Rechner TNC 320/TNC 320 11
SEW Movitrac MC07B0015-5A3-4-00
SEW Movitrac 31C011-503-4-00 + FBG 31C-08
SEW Movitrac 31C007-503-4-00
SEW Movitrac 31C011-503-4-00
SEW Movitrac 31C014-503-4-00
SEW Eurodrive Movitrac 31C005-503-4-21
SEW Eurodrive Movitrac 31C005-503-4-00
SEW Movitrac 31C110-503-4-00
SEW Eurodrive 31C110-503-4-00
Bregenhorn Butow TRS120/2Z
Bregenhorn Butow TRS 120/10WPZ

1756-L62S 1756-L62S  1756-L62S  
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