Device exchange and spare parts compatibility
D.1 Exchanging a V3.0 CPU for a V4.2 CPU
S7-1200 Programmable controller
1574 System Manual, V4.2, 09/2016, A5E02486680-AK
S7-1200 V4.2 CPUs do not support the V1.0 and V2.0 motion libraries. If you perform a
device exchange for a STEP 7 project with V1.0 or V2.0 motion libraries, the device
exchange substitutes compatible V3.0 motion control instructions (Page 731) for the V1.0 or
V2.0 motion library instructions at compile.
If you perform a device exchange from a V3.0 CPU to a V4.2 CPU for a STEP 7 project that
contains two different motion control instruction versions (V3.0 and V5.0), the device
exchange substitutes compatible V5.0 motion control instructions (Page 731) at compile.
During a device exchange from a V3.0 CPU to a V4.2 CPU, the motion control Technological
Object (TO) version does not automatically change from V3.0 to V5.0. If you want to upgrade
to the later versions, you must go to the Instruction tree and select the required S7-1200
Motion Control version for your project as shown in the table below:
Allowed motion control versions
V4.2 (motion control V5.0)
V4.1 (motion control V5.0) V5.0 or V4.0 or V3.0
V4.0 (motion control V4.0)
V3.0 (motion control V3.0)
The TO structure is different between motion control versions V3.0 and V5.0. All associated
blocks change as well. Block interfaces, watch tables, and traces update to the new motion
control V5.0 structure. You can find the differences between the V3.0 CPU and V4.2 CPU
motion control axis parameters in the following two tables:
V3.0 CPU
(Motion control V3.0)
V4.2 CPU
(Motion control V5.0)
Config.General.LengthUnit
Config.Mechanics.PulsesPerDriveRevolution Actor.DriveParameter.PulsesPerDriveRevolution
Config.Mechanics.LeadScrew
Config.Mechanics.InverseDirection
Config.DynamicLimits.MinVelocity
DynamicLimits.MinVelocity
Config.DynamicLimits.MaxVelocity
DynamicLimits.MaxVelocity
Config.DynamicDefaults.Acceleration
DynamicDefaults.Acceleration
Config.DynamicDefaults.Deceleration
DynamicDefaults.Deceleration
Config.DynamicDefaults.EmergencyDeceleration
DynamicDefaults.EmergencyDeceleration
Config.DynamicDefaults.Jerk
Config.PositionLimits_SW.Active
Config.PositionLimits_SW.MinPosition
PositionLimitsSW.MinPosition
Config.PositionLimits_SW.MaxPosition
PositionLimitsSW.MaxPosition
Config.PositionLimits_HW.Active
Config.PositionLimits_HW.MinSwitchedLevel
PositionLimitsHW.MinSwitchLevel
Config.PositionLimits_HW.MaxSwitchedLevel
PositionLimitsHW.MaxSwitchLevel
Config.Homing.AutoReversal
Config.Homing.SideActiveHoming Sensor[1].ActiveHoming.SideInput
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