User Manual
Chapter 4
GFK-2849A
Oct 2019
System Operation
96
ECM850 will be given to the IEDs over wire. If the Protocol outputs are disabled for an
EMC850 module, then output commands coming from Rx3i CPU will be blocked and
commands or controls will not reach the IEDs.
Bit:
10 in the “ModuleStatus” for each ECM850 (Outputs Disabled)
provides the status of
Protocol outputs.
This SVC REQ block is available for all PACSystems RX3i CPUs on which ECM850 is supported.
However, this can be used to disable protocol outputs on standby units in HSB system to
handle HSB scenarios like SAU/SBU, NSAU, Mode transitions. Refer to the Hot standby
operation for ECM850 for details.
Instructions for Usage
The parameter block has a length of 2 WORDs. It is an input parameter block only.
address
Module Slot (low byte)
Module Rack (high byte)
a 1
0 = Enable Protocol Outputs
1 = Disable Protocol Outputs
Example
A switch on a control console is wired to %M00001, the input to the SVC_REQ 47 instruction.
When closed, the switch will activate the SVC_REQ 47, causing the ECM850 output
production to be enabled or disabled.
Figure 82
Instruction Timing
The execution times of the SVC_REQ 47 block in RX3i CPUs is given in the table below.
SVC_REQ
CPE305, CPE310
CPU310
CPU315
CPU320, CRU320
1
Enabled
(µs)
Disabled
(µs)
Enabled
(µs)
Disabled
(µs)
Enabled
(µs)
Disabled
(µs)
Enabled
(µs)
Disabled
(µs)
47
5.343
1.149
NA
NA
3.583
0.832
3.377
0.818
NA = not applicable (CPU310 does not support SVC_REQ 47).
1
Due to E
rror Checking and Correction (ECC), the CRU320’s times are approximately 5% slower on average than the
CPU320’s.
